* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial;
    background: #f2f2f2;
}

.khung {
    width: 1000px;
    margin: 20px auto;
    background: white;
    border: 1px solid black;
}

/* Top Header */
.topHeader {
    height: 40px;
    background: #333;
    color: white;
    overflow: hidden;
    position: relative;
}

.chayChu {
    position: absolute;
    white-space: nowrap;
    right: -300px;
    top: 10px;
    animation: chay 10s linear infinite;
}

.chayChu a {
    color: white;
    text-decoration: none;
    margin: 0 10px;
}

@keyframes chay {
    from {
        right: -300px;
    }
    to {
        right: 100%;
    }
}

/* Navigation */
.navigation {
    background: #228B22;
    text-align: center;
    padding: 10px;
}

.navigation a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
}

/* Header */
.header {
    display: flex;
    padding: 10px;
}

.logo {
    width: 20%;
    height: 120px;
    text-align: center;
    line-height: 120px;
    font-weight: bold;
}

.banner {
    width: 80%;
    height: 120px;
    background: lightblue;
    text-align: center;
    padding-top: 30px;
    border: 1px solid black;
}

/* Main */
.main {
    display: flex;
    padding: 10px;
}

/* Sidebar */
.sidebar {
    width: 25%;
    background: #eeeeee;
    padding: 10px;
    border: 1px solid black;
}

.sidebar h3 {
    margin-bottom: 10px;
}

.tieuMuc {
    margin-top: 20px;
}

.sidebar ul {
    padding-left: 20px;
}

.sidebar li {
    margin-bottom: 8px;
}

.sidebar a {
    text-decoration: none;
    color: black;
}

.bxh p {
    margin-bottom: 8px;
}

/* Quảng cáo */
.quangcao {
    margin-top: 20px;
    padding: 10px;
    background: #fff3cd;
    border: 1px solid black;
}

.quangcao h3 {
    margin-bottom: 10px;
}

.quangcao ul {
    padding-left: 20px;
}

.quangcao li {
    margin-bottom: 8px;
}

.quangcao a {
    text-decoration: none;
    color: darkblue;
}

/* Content */
.content {
    width: 75%;
    padding: 10px;
    border: 1px solid black;
    margin-left: 10px;
}

.content h3 {
    margin-bottom: 10px;
}

.item {
    border: 1px solid gray;
    padding: 10px;
    margin-top: 10px;
    background: #fafafa;
}

.item img {
    width: 220px;
    height: 120px;
    display: block;
    margin-bottom: 10px;
    border: 1px solid black;
}

.item h4 {
    margin-bottom: 8px;
}

/* Footer */
.footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 15px;
    margin-top: 10px;
}
.item img {
    width: 220px;
    height: 120px;
    display: block;
    margin-bottom: 10px;
    border: 1px solid black;
}
.quangcao a {
    text-decoration: none;
    color: darkblue;
}

.quangcao a:hover {
    color: red;
    text-decoration: underline;
}