/* For small devices (max-width: 576px) */
@media (max-width: 576px) {
    .projects_single_buttons a{
        font-size: 1em;
    }
}
/* For medium devices (max-width: 768px) */
@media (max-width: 768px) {
    .projects_single_buttons a{
        font-size: 1.2em;
    }
}