body {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 14px;
    font-style: normal;
    line-height: 1.5;
    margin-left: 0;
    margin-right: 0;
    margin-top: 0;
    margin-bottom: 0;
}

header {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px;
}

nav {
    background-color: #555;
    padding: 10px;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

nav ul li {
    display: inline-block;
    margin-right: 10px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 5px 10px;
}

nav ul li a:hover {
    background-color: #777;
}

aside {
    background-color: #ddd;
    padding: 10px;
    width: 200px;
    float: left;
    height: 100%;
}

aside h2 {
    font-size: 18px;
    font-weight: bold;
}

main {
    padding-top: 10px;
    padding-left: 10px;
    padding-right: 10px;
    padding-bottom: 10px;
    margin-left: 220px;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px;
    clear: both;
}

h1 {
    color: wheat;
    text-shadow: 1px 1px 1px #999;
}

h2, h3 {
    color: gray;
}

p {
    font-size: 14px;
    line-height: 1.5;
}

a:link {
    color: cadetblue;
}

a:visited {
    color: cadetblue;
}

a:hover {
    color: cornflowerblue;
}

a:active {
    color: cornflowerblue;
}

.hover-hidden:hover {
    visibility: hidden;
}

table {
    border-style: solid;
    border-color: #555;
    border-width: 1px;
    width: 100%;
}

table th, table td {
    padding: 5px;
    text-align: left;
    vertical-align: middle;
}

form {
    margin-bottom: 10px;
}

img {
    width: 10%;
    height: auto;
}

input[type="text"], input[type="email"], textarea {
    width: 100%;
    padding: 5px;
    margin-bottom: 5px;
    border-style: solid;
    border-color: #ccc;
    border-width: 1px;
}

input[type="submit"] {
    background-color: #555;
    color: #fff;
    padding: 5px 10px;
    border: none;
    cursor: pointer;
}

.content {
    margin-bottom: 20px;
    height: 600px;
}

.content::before {
    content: "";
    background-image: url('./../images/background.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    opacity: 0.5;
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -1;
}