html, body {
    height: 100%;
}

.loader {
    border: 2px solid #f3f3f3;
    border-radius: 50%;
    border-top: 2px solid #3498db;
    width: 32px;
    height: 32px;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
}

.main {
    height: 100%;
    display: -webkit-flexbox;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-flex-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
    justify-content: center;
}

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

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

@media (prefers-color-scheme: light) {
    body {
        background-color: #FFFFFF;
    }
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: #000000;
    }
}