@media only screen and (max-width: 768px) {
    header .navbar-brand {
        padding-left: 1rem;
    }

    .section-1 .row .col-md-6 .panel {
        position: initial;
        width: initial;
        height: initial;
    }

    .section-2 .cover {
        background-position: -25vmin -10vmin;
    }

    .numbers .rect {
        width: 10rem;
        height: 8rem;
    }

    .numbers .rect h1 {
        font-size: 2rem;
    }

    footer .row .col-md-2 {
        margin-top: 8vmin;
    }
}

/* screen size 375px */

@media only screen and (max-width: 375px) {
    .section-4 .card {
        width: 18em;
    }
}

@media only screen and (max-width: 320px) {
    .section-4 .carousel-inner {
        margin-left: -4vmin;
    }
}