h1 {
    color: green;
    font-style:italic;
    font-family: system-ui;
}
#main-heading {
    font-size: 48px;
}
strong {
color: yellowgreen;
}
p strong {
font-size: 24px;
}
.highlight {
background-color: burlywood;
}
.highlight strong {
background-color: thistle;
}

em {
background-color: aqua;
}

pre{
color: blueviolet;
}