h1{
    color: red;
}
h2{
    background-color: cadetblue;
    color: white;
    margin: 0px;
}
h3{
    color: #006d1d;
    border-bottom: solid 1px #006d1d;
    border-left: solid 10px #006d1d;
}
h4{
                color: red;
                text-align: center;
                border: solid 1px black;
                background-color: white;
                font-size: 24px;
            }
section{
    border: 1px solid black;
    margin: 10px;
    padding: 20px;
}
article{
    border: 4px dotted red;
}
.main{
    width: 750px;
    margin: auto;
    border: 1px solid black;
    background-color: #cadbd8;
}