h1{
    text-align: center;
    font-size: 2.5rem;
}
#main-content{
    color: #333;
}
section{
    margin-bottom: 80px;
}

.underline{
    text-decoration: underline;
}
.font-bold{
    font-weight: bolder;
}
@media (max-width: 768px) {
    h1{
        font-size: 22px;
    }
}