Simple CSS Spinner

spinner.html

<div class="spinner">
    <div class="rect1"></div>
    <div class="rect2"></div>
    <div class="rect3"></div>
    <div class="rect4"></div>
    <div class="rect5"></div>
</div>
<style>
    .spinner {
        margin: 100px auto;
        width: 50px;
        height: 30px;
        text-align: center;
        font-size: 10px;
        position:relative;
    }

    .spinner > div {
        background-color: #333;
        height: 100%;
        width: 6px;
        display: inline-block;

        -webkit-animation: stretchdelay 1.2s infinite ease-in-out;
        animation: stretchdelay 1.2s infinite ease-in-out;
    }

    .spinner .rect2 {
        -webkit-animation-delay: -1.1s;
        animation-delay: -1.1s;
    }

    .spinner .rect3 {
        -webkit-animation-delay: -1.0s;
        animation-delay: -1.0s;
    }

    .spinner .rect4 {
        -webkit-animation-delay: -0.9s;
        animation-delay: -0.9s;
    }

    .spinner .rect5 {
        -webkit-animation-delay: -0.8s;
        animation-delay: -0.8s;
    }

    @-webkit-keyframes stretchdelay {
        0%, 40%, 100% { -webkit-transform: scaleY(0.4) }
        20% { -webkit-transform: scaleY(1.0) }
    }

    @keyframes stretchdelay {
        0%, 40%, 100% {
            transform: scaleY(0.4);
            -webkit-transform: scaleY(0.4);
        }  20% {
               transform: scaleY(1.0);
               -webkit-transform: scaleY(1.0);
           }
    }
</style>