header>a>img{
    width: 20%;
}
header>img{
    width: 20%;
    position: relative;
    left: 200px;
}
.top-right{
    letter-spacing: 3px;
    border-radius: 10px;
    padding: 10px;
    margin: 50px;
    position: absolute;
    background-color: black;
    color: white;
    text-decoration: none;
    left: 1000px;
    top: 0;
}
.top-right>a{
    text-decoration: none;
    color: white;
}
header>h2 {
    text-align: center;
    font-size: small large;
}
header>h2>a {
    color: black;
    text-decoration: none;
    margin: 20px;
}
h3{
    color: gray;
}
.middle>a{
    color: black;
    text-decoration: none;
}
nav{
    left: 100px;
    position: absolute;
}
article{
    margin: 100px;
    padding: 10px;
    position: absolute;
    left: 300px;
    text-align: right;
    top: 150px;
}
article>div>img{
    width: 30%;
}
.anh1{
    position: absolute;
    top: 1700px;
    left: 50px;
}
footer{
    left: 0;
    width: 100%;
    top: 2000px;
    position: absolute;
    text-align: center;
    color: white;
    background-color: gray;
}
footer>img {
    width: 6%;
    height: 100px;
    right: 100px;
}