@media screen and (max-width: 768px) {
    #wrapper {
        font-size: 12px;
    }

    #form-register {
        font-size: 10px;
    }

    .triangle {
        border-top: 10px solid transparent;
        border-bottom: 10px solid transparent;
        border-left: 17.5px solid green;
        margin-right: 15px;
    }

    #featured-courses p {
        font-size: 7px;
    }
}