Tạo hiệu ứng gợn sóng (Ripple Effect) cho blogspot

.ripple:after {
        content: "";
        display: block;
        position: absolute;
        width: 100%;
        height: 100%;
        top: 0;
        left: 0;
        pointer-events: none;
        background-image: radial-gradient(circle, #000 10%, transparent 10.01%);
        background-repeat: no-repeat;
        background-position: 50%;
        transform: scale(10, 10);
        opacity: 0;
        transition: transform .5s, opacity 1s
    }

.ripple:active:after {
        transform: scale(0, 0);
        opacity: .2;
        transition: 0s
    }

.btn {
        display: inline-block;
        padding: 6px 12px;
        margin-bottom: 0;
        font-size: 14px;
        font-weight: normal;
        line-height: 1.42857143;
        text-align: center;
        white-space: nowrap;
        vertical-align: middle;
        -ms-touch-action: manipulation;
        touch-action: manipulation;
        cursor: pointer;
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        background-image: none;
        border: 1px solid transparent;
        border-radius: 4px;
    }

.btn:focus,
    .btn:active:focus,
    .btn.active:focus,
    .btn.focus,
    .btn:active.focus,
    .btn.active.focus {
        outline: 5px auto -webkit-focus-ring-color;
        outline-offset: -2px;
    }

.btn:hover,
    .btn:focus,
    .btn.focus {
        color: #333;
        text-decoration: none;
    }

.btn:active,
    .btn.active {
        background-image: none;
        outline: 0;
        -webkit-box-shadow: inset 0 3px 5px rgba(0, 0, 0, .125);
        box-shadow: inset 0 3px 5px rgba(0, 0, 0, .125);
    }

.btn.disabled,
    .btn[disabled] {
        cursor: not-allowed;
        filter: alpha(opacity=65);
        -webkit-box-shadow: none;
        box-shadow: none;
        opacity: .65;
    }

a.btn.disabled {
        pointer-events: none;
    }

.btn-default {
        color: #333;
        background-color: #fff;
        border-color: #ccc;
    }

.btn-default:focus,
    .btn-default.focus {
        color: #333;
        background-color: #e6e6e6;
        border-color: #8c8c8c;
    }

.btn-default:hover {
        color: #333;
        background-color: #e6e6e6;
        border-color: #adadad;
    }

.btn-default:active,
    .btn-default.active {
        color: #333;
        background-color: #e6e6e6;
        border-color: #adadad;
    }

.btn-default:active:hover,
    .btn-default.active:hover,
    .btn-default:active:focus,
    .btn-default.active:focus,
    .btn-default:active.focus,
    .btn-default.active.focus {
        color: #333;
        background-color: #d4d4d4;
        border-color: #8c8c8c;
    }

.btn-default:active,
    .btn-default.active {
        background-image: none;
    }

.btn-default.disabled:hover,
    .btn-default[disabled]:hover,
    .btn-default.disabled:focus,
    .btn-default[disabled]:focus,
    .btn-default.disabled.focus,
    .btn-default[disabled].focus {
        background-color: #fff;
        border-color: #ccc;
    }

.btn-default .badge {
        color: #fff;
        background-color: #333;
    }

.btn-primary {
        color: #fff;
        background-color: #337ab7;
        border-color: #2e6da4;
    }

.btn-primary:focus,
    .btn-primary.focus {
        color: #fff;
        background-color: #286090;
        border-color: #122b40;
    }

.btn-primary:hover {
        color: #fff;
        background-color: #286090;
        border-color: #204d74;
    }

.btn-primary:active,
    .btn-primary.active {
        color: #fff;
        background-color: #286090;
        border-color: #204d74;
    }

.btn-primary:active:hover,
    .btn-primary.active:hover,
    .btn-primary:active:focus,
    .btn-primary.active:focus,
    .btn-primary:active.focus,
    .btn-primary.active.focus {
        color: #fff;
        background-color: #204d74;
        border-color: #122b40;
    }

.btn-primary:active,
    .btn-primary.active {
        background-image: none;
    }

.btn-primary.disabled:hover,
    .btn-primary[disabled]:hover,
    .btn-primary.disabled:focus,
    .btn-primary[disabled]:focus,
    .btn-primary.disabled.focus,
    .btn-primary[disabled].focus {
        background-color: #337ab7;
        border-color: #2e6da4;
    }

.btn-primary .badge {
        color: #337ab7;
        background-color: #fff;
    }

.btn-success {
        color: #fff;
        background-color: #5cb85c;
        border-color: #4cae4c;
    }

.btn-success:focus,
    .btn-success.focus {
        color: #fff;
        background-color: #449d44;
        border-color: #255625;
    }

.btn-success:hover {
        color: #fff;
        background-color: #449d44;
        border-color: #398439;
    }

.btn-success:active,
    .btn-success.active {
        color: #fff;
        background-color: #449d44;
        border-color: #398439;
    }

.btn-success:active:hover,
    .btn-success.active:hover,
    .btn-success:active:focus,
    .btn-success.active:focus,
    .btn-success:active.focus,
    .btn-success.active.focus {
        color: #fff;
        background-color: #398439;
        border-color: #255625;
    }

.btn-success:active,
    .btn-success.active {
        background-image: none;
    }

.btn-success.disabled:hover,
    .btn-success[disabled]:hover,
    .btn-success.disabled:focus,
    .btn-success[disabled]:focus,
    .btn-success.disabled.focus,
    .btn-success[disabled].focus {
        background-color: #5cb85c;
        border-color: #4cae4c;
    }

.btn-success .badge {
        color: #5cb85c;
        background-color: #fff;
    }

.btn-info {
        color: #fff;
        background-color: #5bc0de;
        border-color: #46b8da;
    }

.btn-info:focus,
    .btn-info.focus {
        color: #fff;
        background-color: #31b0d5;
        border-color: #1b6d85;
    }

.btn-info:hover {
        color: #fff;
        background-color: #31b0d5;
        border-color: #269abc;
    }

.btn-info:active,
    .btn-info.active {
        color: #fff;
        background-color: #31b0d5;
        border-color: #269abc;
    }

.btn-info:active:hover,
    .btn-info.active:hover,
    .btn-info:active:focus,
    .btn-info.active:focus,
    .btn-info:active.focus,
    .btn-info.active.focus {
        color: #fff;
        background-color: #269abc;
        border-color: #1b6d85;
    }

.btn-info:active,
    .btn-info.active {
        background-image: none;
    }

.btn-info.disabled:hover,
    .btn-info[disabled]:hover,
    .btn-info.disabled:focus,
    .btn-info[disabled]:focus,
    .btn-info.disabled.focus,
    .btn-info[disabled].focus {
        background-color: #5bc0de;
        border-color: #46b8da;
    }

.btn-info .badge {
        color: #5bc0de;
        background-color: #fff;
    }

.btn-warning {
        color: #fff;
        background-color: #f0ad4e;
        border-color: #eea236;
    }

.btn-warning:focus,
    .btn-warning.focus {
        color: #fff;
        background-color: #ec971f;
        border-color: #985f0d;
    }

.btn-warning:hover {
        color: #fff;
        background-color: #ec971f;
        border-color: #d58512;
    }

.btn-warning:active,
    .btn-warning.active {
        color: #fff;
        background-color: #ec971f;
        border-color: #d58512;
    }

.btn-warning:active:hover,
    .btn-warning.active:hover,
    .btn-warning:active:focus,
    .btn-warning.active:focus,
    .btn-warning:active.focus,
    .btn-warning.active.focus {
        color: #fff;
        background-color: #d58512;
        border-color: #985f0d;
    }

.btn-warning:active,
    .btn-warning.active {
        background-image: none;
    }

.btn-warning.disabled:hover,
    .btn-warning[disabled]:hover,
    .btn-warning.disabled:focus,
    .btn-warning[disabled]:focus,
    .btn-warning.disabled.focus,
    .btn-warning[disabled].focus {
        background-color: #f0ad4e;
        border-color: #eea236;
    }

.btn-warning .badge {
        color: #f0ad4e;
        background-color: #fff;
    }

.btn-danger {
        color: #fff;
        background-color: #d9534f;
        border-color: #d43f3a;
    }

.btn-danger:focus,
    .btn-danger.focus {
        color: #fff;
        background-color: #c9302c;
        border-color: #761c19;
    }

.btn-danger:hover {
        color: #fff;
        background-color: #c9302c;
        border-color: #ac2925;
    }

.btn-danger:active,
    .btn-danger.active {
        color: #fff;
        background-color: #c9302c;
        border-color: #ac2925;
    }

.btn-danger:active:hover,
    .btn-danger.active:hover,
    .btn-danger:active:focus,
    .btn-danger.active:focus,
    .btn-danger:active.focus,
    .btn-danger.active.focus {
        color: #fff;
        background-color: #ac2925;
        border-color: #761c19;
    }

.btn-danger:active,
    .btn-danger.active {
        background-image: none;
    }

.btn-danger.disabled:hover,
    .btn-danger[disabled]:hover,
    .btn-danger.disabled:focus,
    .btn-danger[disabled]:focus,
    .btn-danger.disabled.focus,
    .btn-danger[disabled].focus {
        background-color: #d9534f;
        border-color: #d43f3a;
    }

.btn-danger .badge {
        color: #d9534f;
        background-color: #fff;
    }

.btn-link {
        font-weight: normal;
        color: #337ab7;
        border-radius: 0;
    }

.btn-link,
    .btn-link:active,
    .btn-link.active,
    .btn-link[disabled] {
        background-color: transparent;
        -webkit-box-shadow: none;
        box-shadow: none;
    }

.btn-link,
    .btn-link:hover,
    .btn-link:focus,
    .btn-link:active {
        border-color: transparent;
    }

.btn-link:hover,
    .btn-link:focus {
        color: #23527c;
        text-decoration: underline;
        background-color: transparent;
    }

.btn-link[disabled]:hover,
    .btn-link[disabled]:focus {
        color: #777;
        text-decoration: none;
    }
</style>
<a class="btn btn-default ripple">Default</a>
<a class="btn btn-primary ripple">Primary</a>
<a class="btn btn-success ripple">Success</a>
<a class="btn btn-info ripple">Info</a>
<a class="btn btn-warning ripple">Warning</a>
<a class="btn btn-danger ripple">Danger</a>
<a class="btn btn-link ripple">Link</a>

​x
 
<style>
    .ripple {
        position: relative;
        overflow: hidden;
        transform: translate3d(0, 0, 0)
    }
​
    .ripple:after {
        content: "";
        display: block;
        position: absolute;
        width: 100%;
        height: 100%;
        top: 0;
        left: 0;
        pointer-events: none;
        background-image: radial-gradient(circle, #000 10%, transparent 10.01%);
        background-repeat: no-repeat;
        background-position: 50%;
        transform: scale(10, 10);
        opacity: 0;
        transition: transform .5s, opacity 1s
    }
​
    .ripple:active:after {
        transform: scale(0, 0);
        opacity: .2;
        transition: 0s
    }
​
    .btn {
        display: inline-block;
        padding: 6px 12px;
        margin-bottom: 0;
        font-size: 14px;
        font-weight: normal;
        line-height: 1.42857143;
        text-align: center;
        white-space: nowrap;
        vertical-align: middle;
        -ms-touch-action: manipulation;
        touch-action: manipulation;
        cursor: pointer;
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;