body {
    font-family: sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    color: #333;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
    padding: 0 20px;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

header h1 {
    margin: 0;
}

main {
    padding: 20px 0;
}

footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 1rem 0;
    position: absolute;
    bottom: 0;
    width: 100%;
}

a {
    color: #333;
    text-decoration: none;
}

a:hover {
    color: #555;
}

.back-link {
    display: block;
    text-align: center;
    margin-top: 20px;
}

.tool-list {
    list-style: none;
    padding: 0;
}

.tool-list li {
    margin-bottom: 10px;
}

.tool-list a {
    font-size: 1.2rem;
    display: block;
    padding: 10px;
    background: #fff;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.tool-list a:hover {
    background: #eee;
}