#single-title {
    text-align: center;
    margin: 3% auto 2%;
    padding: 0 3%;
    line-height: 1.3;
}

@media (max-width:768px) {
    #single-title {
        font-size: 35px;
    }

}

@media (max-width:425px) {
    #single-title {
        font-size: 25px;
    }

}