/* bai1 */
#container{
    width: 1200px; background-color: antiquewhite; margin: auto;
}
#header{
    height: 200px; border-style: solid;
}
#menu{
    background-color: aquamarine; height: 50px;
}
.sp{
    width: 350px; height: 250px; box-sizing: border-box;
    border: sandybrown; float: left; margin: 15px;
    border-radius: 20px; padding: 30px;
}



/* Baitap1 Tren lop */
body{
    background-color:#dddddd;
    font-family:Times New Roman;
}

/* Khung thứ nhất */
.box1{
    width:500px;
    margin:20px auto;
    padding:20px;
    background:#FFFFCC;
    border:3px solid blue;
    border-radius:10px;
    text-align:center;
}

.box1 h2{
    color:red;
}

.box1 p{
    text-align:justify;
}


/* Khung thứ hai */
.box2{
    width:500px;
    margin:20px auto;
    padding:20px;
    border:3px solid blue;
    border-radius:10px;
    text-align:center;
    color:white;

    background-image:url("img/me.jpg");
    background-size:cover;
}

.box2 h2{
    color:#66FF33;
}

.box2 p{
    line-height:1.6;
}



/* Baitap2 Tren lop */
body{
    margin:0;
    font-family: "Times New Roman", Times, serif;
}

/* khung trang */
#container{
    width:100%;
    border:3px solid black;
    min-height:100vh;
    box-sizing: border-box;
}

/* header */
header{
    background:#6f6f6f;
    color:white;
    text-align:center;
    padding:70px 0;
}

header h1{
    margin:0;
    font-size:50px;
}

/* phần giữa */
.main{
    display:flex;
    min-height:400px;
    font-size:35px;
}

/* menu bên trái */
nav{
    width:250px;
    background:#bdbdbd;
    padding:20px;
}

nav a{
    display:block;
    margin-bottom:10px;
    color:purple;
    font-size:35px;
}

/* nội dung bên phải */
section{
    flex:1;
    background:#dcdcdc;
    padding:30px;
}

section h2{
    margin-top:0;
}

/* footer */
footer{
    background:#6f6f6f;
    color:white;
    text-align:center;
    padding:20px;
    font-size:35px;
}



/* Baitap3 Tren lop */
body{
    margin:0;
    font-family:Times New Roman;
}

/* Khung chính */
.container{
    width:100%;
    border:2px solid #333;
}

/* Header */
header{
    background:#FCC;
    text-align:center;
    padding:20px;
}

/* Khu vực nội dung */
.content{
    background:#ddd;
    padding:20px;
}

/* 3 cột */
.city{
    float:left;
    width:30%;
    margin:1.5%;
}

/* hình ảnh */
.city img{
    width:100%;
    margin-top:10px;
}

/* Footer */
footer{
    background:#FCC;
    text-align:center;
    padding:15px;
    clear:both;
}