.demo{ background: linear-gradient(to right,#7b4379,#dc2430);}

.preloader{
    height: 80px;
    width: 80px;
    margin: 20px auto 0;
    position: relative;
}

.preloader:before,
.preloader:after{
    content: '';
    height: 100%;
    width: 100%;
    border: 9px solid #fff;
    border-color: transparent #fff;
    position: absolute;
    left: 0;
    top: 0;
    animation: spin 2.2s linear 0s infinite normal;
}

.preloader:after{
    width: 50%;
    height: 50%;
    margin: auto;
    border-style: dotted;
    border-radius: 50px;
    left: 0;
    top: 0;
    bottom: 0;
    right: 0;
    animation: spinback 1.5s linear 0s infinite normal;
}

@keyframes spin{
    from{ transform: rotate(0); }
    to{ transform: rotate(360deg); }
}

@keyframes spinback{
    from{ transform:rotate(0); }
    to{ transform:rotate(-360deg); }
}