body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    line-height: 1.5;
    color: #24292e;
    margin: 0;
}

header {
    background-color: #24292e;
    color: #fff;
    padding: 16px;
}

header nav a {
    color: #fff;
    text-decoration: none;
    margin-right: 16px;
    font-weight: 600;
}

main {
    max-width: 1012px;
    margin: 32px auto;
    padding: 0 16px;
}

h2 {
    border-bottom: 1px solid #eaecef;
    padding-bottom: 8px;
}

form div {
    margin-bottom: 16px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

input[type="text"],
input[type="email"],
input[type="password"],
textarea {
    width: 100%;
    padding: 8px;
    border: 1px solid #d1d5da;
    border-radius: 3px;
    box-sizing: border-box;
}

button {
    background-color: #2ea44f;
    color: #fff;
    border: 1px solid rgba(27, 31, 35, .15);
    border-radius: 6px;
    padding: 6px 16px;
    font-weight: 600;
    cursor: pointer;
}

button:hover {
    background-color: #2c974b;
}

ul {
    list-style: none;
    padding: 0;
}

.repo-tree ul li {
    padding: 8px;
    border-bottom: 1px solid #eaecef;
}

.commit-list li {
    margin-bottom: 16px;
    padding: 12px;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
}

pre {
    background-color: #f6f8fa;
    padding: 16px;
    border-radius: 6px;
    overflow: auto;
}

footer {
    text-align: center;
    padding: 32px;
    color: #6a737d;
    border-top: 1px solid #eaecef;
}