body {
    font-family: Arial, sans-serif;
    background: url('https://streppy.cn/files/pic.jpg') no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-attachment: fixed; 
    background-size: cover;
    color: #333;
}
canvas {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1;
    pointer-events: none;
}

h2 {
    text-align: center;
    color: white;
    margin-top: 100px;
    font-size: 36px;
    position: relative;
    z-index: 2;
}

@media (min-width: 768px) {
    h2 { font-size: 48px; }
}

@media (min-width: 1200px) {
    h2 { font-size: 65px; }
}

input[type="text"],
input[type="password"],
input[type="number"] {
    display: block;
    margin: 15px auto;
    padding: 10px 5px;
    width: 90%;
    font-size: 18px;
    border: none;
    border-radius: 5px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    background-color: #fff;
    transition: all 0.3s;
    position: relative;
    z-index: 2;
}

@media (min-width: 768px) {
    input[type="text"],
    input[type="password"],
    input[type="number"] { width: 50%; }
}

table {
    width: 90%;
    margin: 20px auto;
    border-collapse: collapse;
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    display: none;
    position: relative;
    z-index: 2;
}

@media (min-width: 768px) {
    table { width: 80%; }
}

th, td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}

th {
    background-color: #000;
    color: white;
    text-transform: uppercase;
    letter-spacing: 1px;
}

tr:nth-child(even) { background-color: #f2f2f2; }
tr:hover { background-color: #f1f1f1; }

.button-group {
    text-align: center;
    margin-top: 20px;
    display: none;
    position: relative;
    z-index: 2;
}

button {
    display: inline-block;
    margin: 10px 5px;
    padding: 10px 15px;
    font-size: 14px;
    border: none;
    border-radius: 4px;
    background-color: #000;
    color: white;
    cursor: pointer;
}

button:hover { background-color: #333; }

a.footer-link {
    color: #333;
    position: fixed;
    bottom: 10px;
    right: 10px;
    z-index: 2;
}