.theme-logo {
    width: 62px;
    height: 62px;
}
body.error404 {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100%25' height='100%25' viewBox='0 0 800 400'%3E%3Cdefs%3E%3CradialGradient id='a' cx='396' cy='281' r='514' gradientUnits='userSpaceOnUse'%3E%3Cstop offset='0' stop-color='%23e6e6e6'/%3E%3Cstop offset='1' stop-color='%23eaf1ff'/%3E%3C/radialGradient%3E%3ClinearGradient id='b' gradientUnits='userSpaceOnUse' x1='400' y1='148' x2='400' y2='333'%3E%3Cstop offset='0' stop-color='%234361ee' stop-opacity='0'/%3E%3Cstop offset='1' stop-color='%234361ee' stop-opacity='0.5'/%3E%3C/linearGradient%3E%3C/defs%3E%3Crect fill='url(%23a)' width='800' height='400'/%3E%3Cg fill-opacity='0.5'%3E%3Ccircle fill='url(%23b)' cx='267.5' cy='61' r='300'/%3E%3Ccircle fill='url(%23b)' cx='532.5' cy='61' r='300'/%3E%3Ccircle fill='url(%23b)' cx='400' cy='30' r='300'/%3E%3C/g%3E%3C/svg%3E");
    background-attachment: fixed;
    background-size: cover;
    background-color: #ffffff;
}
body.error404 > .error-content {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 30px;
}
.error404 .mini-text {
    font-size: 33px;
    font-weight: 700;
    margin-bottom: 0;
    color: #4361ee;
}
.error404 .img-cartoon { width: 170px; height: 170px; }
.error404 .error-number {
    font-size: 170px;
    color: #fff;
    font-weight: 600;
    margin-bottom: 5px;
    margin-top: 15px;
    text-shadow: 0px 5px 4px rgba(31, 45, 61, 0.10196078431372549);
}
.error404 .error-text { font-size: 18px; color: #3b3f5c; font-weight: 600; }
.error404 a.btn {
    width: 134px;
    padding: 6px;
    font-size: 17px;
    background-image: linear-gradient(135deg, #4361ee 0%, #805dca 100%);
    border: none;
    letter-spacing: 2px;
}
.error404 a.btn:hover, .error404 a.btn:not(:disabled):not(.disabled):active { background-image: linear-gradient(to right, #4361ee 0%, #805dca 100%); }