.spinner {
    width: 40px;
    height: 40px;
    background-color: #333;
  
    margin: 100px auto;
    animation: sk-rotateplane 1.2s infinite ease-in-out;
}

@keyframes sk-rotateplane {
    0% {
        transform: perspective(120px) rotateX(0deg) rotateY(0deg);
    } 50% {
        transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
    } 100% {
        transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
    }
}