Untitled

*{
    margin: 0px;
    padding: 0px;
}
body{
    background: rgb(114, 230, 91);
    font-family: Arial, Helvetica, sans-serif;
}
#container{
    width: 70%;
    margin:0px auto;
    border: 1px solid black;
}
header{
    background-color: red;
    height: 100px;
    width: 100%;
    margin: 0px;
    text-align: center;
    line-height: 100px;
    color: white;
    border-bottom: 3px dashed black;
}