body {
    background-color: rgb(35, 35, 35);
    color: white;
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
}
header {
    background-color: rgb(35, 35, 35);
    background-image: url("images/background.jpg");
    background-size: 100%;
    background-position: center;
    height: 220px;
    padding: 10px;
}
ul {
    list-style: none;
}
.nav-format {
    margin-top: 40px;
    background-color: rgba(23, 23, 23, 0.6);
    border-radius: 8px;
    color: white;
    padding: 20px;
    display: flex;
    flex-direction: row;
}
.nav-item {
    font-size: 18px;
    font-weight: bolder;
    text-align: center;
    width: 22%;
    margin: auto;
    cursor: pointer;
}
.header-format {
    color: white;
    padding: 20px;
    text-align: center;
    display: flex;
    flex-direction: row;
    border-radius: 10px;
}
a:link {
    text-decoration: none;
    color: inherit;
}
a:visited {
    text-decoration: none;
    color: inherit;
}
a:hover {
    text-decoration: none;
    background-color: rgb(255, 0, 0);
    padding: 15px;
    border-radius: 10px;
    color: rgb(255, 255, 255);
}
header .header-img {
    background-image: url("images/logo.png");
    background-size: 300px;
    background-repeat: no-repeat;
    text-align: center;
    position: relative;
    height: 30px;
    width: 370px;
    text-indent: -9999999999999px;
}