div#header {
    margin-top: 70px;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
    width: 100%;
    height: 430px;
    background: url(../img/bridge.png);
    background-size: cover;
    background-position: center;
}

div#header h1 {
    text-align: center;
    font-weight: bold;
    text-transform: uppercase;
    color: white;
    font-size: 3.5em;
}

@media screen and (max-width: 750px) {
    div#header h1 {
        font-size: 2em;
    }
}

@media screen and (max-width: 550px) {
    div#header {
        height: 250px;
    }
}

div.middle-text * {
    margin: 5px auto;
    padding: 15px;
    width: 100%;
    max-width: 1100px;
    font-weight: 400;
    font-size: 16px;
}

div.middle-text h1 {
    font-size: 38px;
}