body {
    background-color: #55efc4;
    font-family: 'Segoe UI', Arial, sans-serif;
    color: #2d3436;
    text-align: center;
    margin: 0;
    padding: 50px 20px;
}

.nong-trai {
    max-width: 600px;
    margin: 0 auto;
    background-color: #ffffff;
    padding: 30px;
    border-radius: 20px;
    border: 5px dashed #00b894;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

h1 {
    color: #00b894;
    font-size: 28px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

label {
    font-weight: bold;
    font-size: 16px;
}

input {
    padding: 12px;
    font-size: 16px;
    border-radius: 8px;
    border: 2px solid #00b894;
    width: 80%;
    margin-top: 10px;
}

.nut-goi {
    background-color: #d63031;
    color: white;
    font-size: 16px;
    font-weight: bold;
    padding: 12px 30px;
    border: 2px solid #d63031;
    border-radius: 50px;
    cursor: pointer;
    margin-top: 15px;
    box-shadow: 0 5px 15px rgba(214, 48, 49, 0.3);
    transition: all 0.2s ease;
}

.nut-goi:hover {
    background-color: #ff7675;
}