/* 既存のスタイルに以下を追加 */
.steam-login-box {
    background-color: #111;
    border: 1px solid #ffd966;
    padding: 15px;
    margin-bottom: 20px;
    box-sizing: border-box;
}

.steam-login-box h3 {
    margin-top: 0;
    color: #ffd966;
    font-size: 16px;
}

.steam-login-box input {
    display: block;
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    background-color: #050505;
    border: 1px solid #3f3f3f;
    color: #ffd966;
    box-sizing: border-box;
    font-family: monospace;
}

#btn-download-steam {
    width: 100%;
    padding: 12px;
    background-color: #ffd966;
    color: #0a0a0a;
    border: none;
    font-weight: bold;
    cursor: pointer;
}

#btn-download-steam:hover {
    background-color: #e6c25c;
}