body {
    background-color: #e0e0e0;
    font-family: 'Times New Roman', Times, serif;
    margin: 0;
}

.container {
    width: 80%;
    margin: 0 auto;
    background-color: white;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    margin-top: 20px;
    margin-bottom: 20px;
}

h1 {
    font-size: 3em;
    font-weight: 800;
    background-image: linear-gradient(to right, #007bff, #00ff66);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h3 {
    color: #333;
    margin-top: 30px;
}

.anh-trang-tri {
    border: 4px dashed #3498db;
    border-radius: 25px;
    display: block;
    width: 200px;
    height: 250px;
    padding: 5px;
    object-fit: cover;
}

table {
    width: 100%;
    background-color: #FFF0F5;
    border-collapse: collapse;
}
table th, table td {
    border: 1px solid #999;
    padding: 10px;
    text-align: center;
}
table caption {
    font-weight: bold;
    margin-bottom: 10px;
}

.link-youtube {
    color: blue;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}
.link-youtube:hover {
    color: red;
}

.nut-bam-dep {
    background-color: #007BFF;
    color: white;
    border: 4px solid #0056b3;
    border-radius: 15px;
    padding: 12px 30px;
    font-size: 18px;
    font-weight: bold;
    font-family: 'Times New Roman', Times, serif;
    cursor: pointer;
    transition: all 0.2s ease;
    outline: none;
}
.nut-bam-dep:hover {
    background-color: #0056b3;
    border-color: #004085;
    transform: scale(0.95);
}

.khoi-van-ban {
    background-color: #f0f8ff;
    padding: 20px;
    border-left: 5px solid #2e8b57;
}
.text-cam {
    color: #d2691e;
    font-weight: bold;
    text-decoration: underline;
}
.text-xanh-la {
    color: #228b22;
    font-style: italic;
}
.text-nen-hong {
    background-color: #ffe4e1;
    padding: 2px 5px;
    border-radius: 4px;
}

.van-ban {
    color: blue;
}
#dong-chu-doc-dao {
    color: red;
    font-weight: bold;
}

.khung-form {
    background-color: #e8f4f8;
    padding: 20px;
    border-radius: 10px;
    border: 2px solid #b0c4de;
    width: 60%;
    margin-bottom: 20px;
}
.input-dai {
    width: 100%;
    padding: 8px;
    margin: 8px 0;
    box-sizing: border-box;
    font-family: 'Times New Roman', Times, serif;
}

}
.btn-gui {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: 'Times New Roman', Times, serif;
}
.btn-gui:hover {
    background-color: #45a049;
}