#preloader {
    position: fixed;
    left: 0;
    top: 0;
    width: 100vw;
    height: 100vh;
    z-index: 99999;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
}
#preloader .preloader-content {
    position: relative;
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}
#preloader .preloader-logo {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 60px;
    height: 60px;
    transform: translate(-50%, -50%);
    z-index: 2;
}
#preloader .spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100px;
    height: 100px;
    transform: translate(-50%, -50%);
    border: 8px solid #f3f3f3;
    border-top: 8px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 1;
}
@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg);}
    100% { transform: translate(-50%, -50%) rotate(360deg);}
}