body {

font-family: Arial, sans-serif;
line-height: 1.6;
background: #111;
color: #eee;
align-items: left;
text-align: center;
line-height: 1.6;
margin: 0 auto;
max-width: 800px;
margin: 0 auto;
padding: 20 px;
background-color: #111;
color: #675;
}
header {
text-align: center;
padding-bottom: 20px;
border-bottom: 2px solid #ccc;
}

nav {
background-color: #333;
}

nav ul.menu {
list-style-type: none;
margin: 0;
padding: 0;
display: flex;
}

nav ul.menu li {
margin: 0;
}

nav ul.menu li a {
display: block;
padding: 14px 20px;
color: white;
text-decoration: none;
}

nav ul.menu li a:hover {
background-color: #555;
}


button {
background-color: #333;
color: #fff;
border: none;
padding: 8px 16px;
margin: 0 5px;
cursor: pointer;
border-radius: 4px;
}

button:disabled {
background-color: #ccc;
cursor: not-allowed;
}

button.active {
background-color: #555;
}