body{
    background-color: aqua;


}
.circle{
    margin: 70px auto;
    width: 40px;
    height: 40px;
    border: 5px solid rgba(255,255,255,0.2);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s linear infinite;
}
@keyframes spin{
    100%{
        transform: rotate(360deg);
    }
}