#billboard::before {
    content: ' ';
    display: block;
    background: linear-gradient( rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5) ), url('images/disembark01.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;
    top: 50%;
    transform: translateY(-50%);
    width: 100%;
    z-index: 19;
}

.spacer {
    width: 70%;
    text-align: center;
    padding: 10vh 15%;
    font-size: 2vw;
}

.bannerImages {
    position: relative;
    display: inline-flex;
    height: 70vh;
    width: 100%;
    overflow: hidden;
}

.bannerImages>* {
    width: 25%; 
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 2vw;
    color: var(--jonquil);
}

.right {
    right: 10%;
}

.left {
    left: 10%;
}

.bannerImages::before {
    content: ' ';
    display: block;
    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. */
}

#one::before {
    background-image: linear-gradient( rgba(0, 0, 0, 0.33), rgba(0, 0, 0, 0.33) ), url('images/JTAC02.png');
    background-position: top;
}

#two::before {
    background-image: linear-gradient(to right, rgba(0, 0, 0, 0.33), rgba(0, 0, 0, 0.1) ), url('images/wallClear.png');
    background-position: top;
}

#three::before {
    background-image: linear-gradient( rgba(0, 0, 0, 0.33), rgba(0, 0, 0, 0.33) ), url('images/techLeft.png');
    background-position: 50%;
}

#four::before {
    background-image: linear-gradient( rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5) ), url('images/squadTravelling.png');
    background-position: 50%;
}

@media screen and (max-width: 768px) {
    .bannerImages {
        height: 57vw;
    }
    .bannerImages::before{
        background-size: contain;
    }
    .bannerImages>* {
        width: 50%;
    }
     
    .spacer h2{
        font-size: 4vw;
    }
    .bannerImages h3 {
        width: 50%;
        font-size: 4vw;
    }
}