@media screen and (max-width: 768px) {
    .nav-items ul li{
        display: block;
    }

    .nav-items{
        position: fixed;
        background: green;
        height: 100vh;
        width: 200px;
        top: 0;
        right: -200px;
        text-align: left;
        z-index: 2;
        transition: 0.5s;
    }

    .nav-items ul {
        padding: 30px;
    }

    nav .fa{
        display: block;
        color: white;
        margin: 10px;
        font-size: 22px;
        cursor: pointer;
    }

    .nav-items ul li a:hover{
        color: darkblue;
    }

    body{
        overflow-x: hidden;
    }

    .intro h1{
        font-size: 2.25rem;
    }
    
    .intro h2{
        font-size: 1.5rem;
    }
    
    .intro p{
        font-size: 0.9rem;
    }

    /* ----Course--- */
    .row{
        flex-direction: column;
    }

    .testimonial-col img{
        overflow-x: visible;
        margin-left: 0px;
        margin-right: 15px;
    }

    .cta h1{
        font-size: 24px;
    }

    .sub-header h1{
        font-size: 24px;
    }
}