H1 {
font-size: 18px;
text-align: left;
background-color: #C0C0C0;
display: inline-block;
margin-left: 120px;
padding: 12px;
border-radius: 15px;
}

@media (prefers-color-scheme: dark) {
H1 {
background-color: #404040;
}
}