h2 { margin: 50px auto; width: 600px; text-align: center; }
form { margin: 50px auto; width: 300px; }
label, input { display: block; margin-bottom: 10px; }
input[type="text"] { width: 100%; padding: 5px; box-sizing: border-box; }
input[type="password"] { width: 100%; padding: 5px; box-sizing: border-box; }
input[type="submit"] { padding: 5px 10px; }
button { width: 100%; padding: 5px 10px; }
table { border-collapse: collapse; width: 100%; }
th, td { border: 1px solid #ccc; padding: 8px; text-align: left; }
th { background-color: #f2f2f2; }