.loader{
    width:40px;
    height:40px;
    border-radius:50%;
    border:10px solid rgba(255, 0, 0, 0);
}

.loader::after{
    content:'';
    position:absolute;
    width:40px;
    height:40px;
    border-radius:50%;
    border:8px solid transparent;
    border-top:8px solid #ffffff;
    animation:rotate 1.3s linear infinite;
}

@keyframes rotate{
    0%{transform:rotate(0deg)}
    100%{transform:rotate(360deg)}
}