来自柯南百科
#mainpage-header {
    box-shadow: rgba(0, 0, 0, 0.2)0px 0px 4px 4px;
    margin: 15px 0;
    margin-bottom: 1.5rem;
    width: 100%;
}

#mainpage-header>img {
    width: 100%!important;
    height: 100%!important;
    min-height: 150px;
    object-fit: cover;
}