body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;  
}
h1{
    text-align: center;
}
header {
    background-color: burlywood;
    color: white;
    padding: 10px 0;
}
nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
}
nav ul li {
    margin: 0 15px;
}
nav ul li a {
    color: white;
    text-decoration: none;
    padding: 5px 10px;
}
nav ul li a:hover {
    background-color: rgb(228, 142, 29);
    border-radius: 5px;
}
main {
    padding: 5px;
    text-align: center;
}
footer {
    background-color: burlywood;
    color: white;
    text-align: center;
    padding: 10px 0;
    position: fixed;
    bottom: 0;
    width: 100%;
}
.error { color: red; font-size: 14px; }
.tab {
    display: inline-block;
    padding: 10px 20px;
    margin: 5px;
    background-color: #eee;
    border-radius: 5px;
    cursor: pointer;
}
.tab.active { background-color: burlywood; color: white; }
.tabContent { display: none; margin-top: 10px; }