html {
    scroll-behavior: smooth;
}
.ana-sayfa {
    background-image: url('images/digital-art-style-river-nature-landscape.jpg');
    background-size: cover;
}
body {
    
    background-color: snow;
    margin: 0;
    padding: 0;
    min-height: 2000px;
}
header {
    margin: 20px auto;
    width: 910px;
    height: 100px;
}
header .logo {
    width: 100px;
    height: 100px;
    background-color: navy;
    float: left;
    margin-right: 10px;
    border: 3px solid black;
    box-sizing: border-box;
    position: relative; 
}
header .banner {
    width: 800px;
    height: 100px;
    background-color: navy;
    float: left;
    border: 3px solid black;
    box-sizing: border-box;
    position: relative; 
}
.chat-box {
    position: absolute;
    bottom: 10px;
    right: 15px;
    padding: 5px 10px;
    border: 1px solid white;
    color: white;
    font-family: Arial;
    font-size: 12px;
}
.new-badge {
    position: absolute;
    top: -12px;
    right: -5px;
    background-color: red;
    color: white;
    font-size: 9px;
    padding: 2px 5px;
    border-radius: 5px;
    font-weight: bold;
}
nav {
    margin: 0px auto;
    width: 770px;
    height: 40px;
    position: sticky; 
    top: 0;       
    z-index: 100;    
}
nav ol {
    margin: 0;
    padding: 0;
}
nav li {
    list-style-type: none;
    float: left;
    margin-right: 10px;
    width: 140px;
    height: 40px;
    background-color: navy;
    text-align: center;
    line-height: 36px;
}
nav li:last-child {
    margin-right: 0;
}
nav li a {
    text-transform: uppercase;
    color: white;
    text-decoration: none;
    font-size: 16px;
    font-weight: bold;
    font-family: Arial, Helvetica, sans-serif;
    letter-spacing: 1px;
    border: 2px solid black;
    box-sizing: border-box;
    display: block;
}
nav li a:hover {
    letter-spacing: 3px;
    background-color: white;
    color: navy;
    border: 2px dashed black;
}
footer {
    margin: 20px auto;
    width: 910px;
    height: 50px;
}
footer .alt {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    background-color: navy;
    border: 2px solid black;
    border-radius: 50%;
    text-align: center;
    line-height: 56px;
    box-sizing: border-box;
    z-index: 1000;
}
footer .alt a {
    text-transform: uppercase;
    color: white;
    text-decoration: none;
    font-family: Verdana;
    font-weight: bold;
    font-size: 12px;
    display: block;
}
footer .alt:hover {
    background-color: white;
    border: 2px dashed navy;
}
footer .alt:hover a {
    color: navy;
}