index.css

body,
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: "Lato", sans-serif;
}

body,
html {
    height: 100%;
    color: #777;
    line-height: 1.8;
}

/* Create a Parallax Effect */
.bgimg-1,
.bgimg-2,
.bgimg-3 {
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

.responsive {
    width: 100%;
    height: auto;
}

.w3-wide {
    letter-spacing: 10px;
}

.w3-hover-opacity {
    cursor: pointer;
}

/* Turn off parallax scrolling for tablets and phones */
@media only screen and (max-device-width: 1600px) {

    .bgimg-1,
    .bgimg-2,
    .bgimg-3 {
        background-attachment: scroll;
        min-height: 400px;
    }
}