style.css

body {
    font-family: 'Abel', Arial, sans-serif;
    background-color: lightgrey;
}
h1, h2, h3, h4, h5, h6 {
    font-family: 'Nerko One', cursive;
    color: indianred
}
h2 {
    font-size: 31px;
}
p {
    font-size: 20px;
    text-align: justify;
}
a {
    color: indianred;
}
header h1 {
    width: 50%;
    margin: 0;
    padding: 5%;
    font-style: italic;
}
header {
    background-image: url("header-bg.jpg");
    background-attachment: fixed;
    background-position: top center;
    background-repeat: no-repeat;
}
footer {
    background-color: indianred;
    height: 300px;
    padding: 20px 50px;
    text-align: center;
}
nav {
        position: sticky;
        top: 0;
        width: 100%;
        text-align: center;
}
nav ul {
    margin: 0;
    padding: 0;
}
nav li{
    list-style: none;
    display: inline-block;
    background-color: indianred;
    color: white;
    width: 25%;
    text-align: center;
    padding: 10px;
}
nav a {
    color:white;
    text-decoration: none;
}
nav a:hover {
    color:goldenrod;
}
nav a:active {
    color:goldenrod;
    font-weight: bold;
}
main {
    width: 90%;
    margin: 0 auto;
}
.structuretable {
    border-spacing: 0;
    width: 100%;
}
.structuretable th {
    background-color:darkslategray;
    color: white;
    padding: 10px;
}
.structuretable td {
    vertical-align: top;
    padding: 10px;
    border-bottom: 1px solid darkslategray;
}
td.element {
    font-weight: bold;
    background-color:whitesmoke;
    text-align: center;
    color: darkslategray;
    vertical-align: middle;
    border: 0;
}
.exampletable {
    margin: 0 auto;
}
.exampletable td {
    border: 1px solid indianred;
    padding: 10px;
    width: 100%;
    font-weight: bold;
}
.insiderows {
    background-color: lightslategray;
    color: white;
}
.insideinsiderows {
    background: darkslategray;
    color: white;
}
.insideinsideinsiderows {
    background: white;
    color: indianred;
}
td#spancell {
    width: 30%;
}
.contact-details h3, .contact-details a {
    color: white;
    font-size: 30px;
    text-decoration: none   ;
}
/*For Desktop*/
@media only screen and (min-width: 610px) {
.exampletable {
    width: 75%;
}
header h1 {
    font-size: 50px;
}
header {
    background-size: cover;
    height: 440px;
}
}
/*For Mobile*/
@media only screen and (max-width: 610px) {
.exampletable {
    width: 100%;
}
header h1 {
    font-size: 31px;
}
header {
    background-size: contain;
    height: 260px;
}
}