.loader {
    width: 100px;
    height: 100px;
    border: 5px solid #FFF;
    border-bottom-color: #FF3D00;
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    position: fixed;
    left:0;
    right: 0;
    margin: 0 auto;
    top: 40%;
}

body {
    background: rgba(243, 243, 247, 1);
}

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