#billboard::before {
    content: ' ';
    display: block;
    background: linear-gradient( rgba(0, 0, 0, 0.25), rgba(0, 0, 0, 0.25) ), url('images/teacher01.png');
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    height: 100%;
    width: 100%;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: -10;  /* This is pretty important. */
}   

#billboard {
    height: 100vh;
    width: 100%;
}

#billboard h1 {
    position: absolute;
    text-align: center;
    font-size: 2vw;
    top: 50%;
    transform: translateY(-50%);
    width: 80%;
    z-index: 19;
    padding: 0 10%;
}

.bigFont {
    font-size: 200%;
}

.littleFont {
    font-size: 75%;
}

.spacer {
    width: 60%;
    font-size: 2vw;
    text-align: center;
    padding: 10vh 20%;
}

.spacer p {
    font-size: 1.5vw;
}

.blockHolder {
    display: inline-flex;
    width: 90%;
    height: 40vw;
    padding: 5vh 5%;
}

.blockHolder>* {
    position: relative;
    top: 50%;
    transform: translateY(-50%);
}

.squarePic {
    height: 40vw;
    width: 40vw;
    object-fit: cover;
}

.contain {
    object-fit: contain;
}

.squareText {
    font-size: 1.5vw;
    height: fit-content;
    position: relative;
    left: 10%;
    width: 40%;
}

.flip {
    display: flex;
    flex-direction: row-reverse;
}

.flip .squareText {
    left: -10%;
}

@media screen and (max-width: 768px) {
    #billboard::before {
        background-position-x: 20%;
    }
    .squarePic {
        height: 90vw;
        width: 90vw;
    }
    .blockHolder {
        display: inline-block;
        padding: 0 5% 20%;
        height: 100%;
    }
    .blockHolder>* {
        transform: none;
    }
    .squareText {
        left: 0;
        text-align: center;
        width: 100%;
        font-size: 3vw;
    }

    .flip .squareText {
        left: 0;
    }
    .squareText h2 {
        margin: 5vh auto;
        width: 80%;
    }
    .spacer{
        font-size: 3vw;
    }
    .spacer p {
        font-size: 3vw;
    }
}