@media (max-width: 767px) {
    /* right */
    .work-exp, .education, .contact {
        display: block;
    }
    .work-exp h2 {
        margin-bottom: 20px;
    }
    .work-exp h3 {
        margin-bottom: 20px;
    }
    .education h2 {
        margin-bottom: 20px;
    }
    .education h3 {
        margin-bottom: 20px;
    }
    .contact h2 {
        margin-bottom: 20px;
    }
    .contact h3 {
        margin-bottom: 20px;
    }
}