body {
    background: linear-gradient(180deg, rgba(255,237,0,1) 100px, rgba(0,212,255,0) 300px);
    background-repeat: no-repeat; 
}

.card-body {
    background-color: rgb(237, 237, 237);    
}

.highlight_immutable {
    text-decoration-color: #00b7ff;
    text-decoration-line: underline;
    text-decoration-thickness: 3px;
}

.highlight_seo {
    background-color: #fcaa44;
}