.alert,.login-container{text-align:center;width:100%}*{box-sizing:border-box;margin:0;padding:0;font-family:Arial,sans-serif}body{display:flex;justify-content:center;align-items:center;height:100vh;background-color:#f0f2f5}.login-container{background-color:#fff;padding:20px;border-radius:8px;box-shadow:0 4px 8px rgba(0,0,0,.1);max-width:400px;margin:0 20px}h2{margin-bottom:20px;color:#333}.login-form .input-group{margin-bottom:15px;text-align:left}.login-form label{display:block;margin-bottom:5px;color:#555}.login-form input{width:100%;padding:10px;border:1px solid #ccc;border-radius:4px}.login-form .btn{width:100%;padding:10px;color:#fff;background-color:#555;border:none;border-radius:4px;cursor:pointer;font-size:16px;transition:background-color .3s,color .3s}.login-form .btn:hover{background-color:#333;color:#daa520}.login-form .btn:active{background-color:#444;color:#daa520}.alert{margin-bottom:15px;color:red;display:block}@media (max-width:600px){.login-container{padding:15px;margin:0 10px}.login-form .btn{font-size:14px}}