html, body {
    width: 100%;
    height: 100%;
    margin: 0;
}

body {
    background: #1a1a1a;
}
.preloading {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
        Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif,
        'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol',
        'Noto Color Emoji';
    box-sizing: border-box;
    line-height: 1.5;
    color: #fff;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s ease;
    flex-direction: column;
    z-index: -1;
}

.loader {
    box-sizing: border-box;
    line-height: 1.5;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #606669;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    margin-bottom: 8px;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
}

@-webkit-keyframes spin {
    0% {
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    100% {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}
@keyframes spin {
    0% {
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    100% {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}