.spinner
{
    width: 48px;
    height: 48px;
    border: 5px solid #FFF;
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    position: relative;
    animation: pulse 1s linear infinite;
}

    .spinner:after
    {
        content: '';
        position: absolute;
        width: 48px;
        height: 48px;
        border: 5px solid #FFF;
        border-radius: 50%;
        display: inline-block;
        box-sizing: border-box;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        animation: scaleUp 1s linear infinite;
    }

@keyframes scaleUp
{
    0%
    {
        transform: translate(-50%, -50%) scale(0)
    }

    60%, 100%
    {
        transform: translate(-50%, -50%) scale(1)
    }
}

@keyframes pulse
{
    0%, 60%, 100%
    {
        transform: scale(1)
    }

    80%
    {
        transform: scale(1.2)
    }
}