* {
    margin: 0;
    box-sizing: border-box;
}
h1{
    background-color: red;
    margin : auto;

}

p {
    font-size: calc(1px + 2vw);
}

img {
    max-width: 100%;
    height: auto;
}

div {
    width: 80vw;
    margin : auto;
    background-color: darkorange;
    text-align: center;
}

nav {
    background-color: darkolivegreen;
    padding: 15px;
}

iframe{
    width: 100%;
}
nav ul {
    padding-left: 0;
}

nav ul li {
    display: inline;
    list-style: none;
}
main{
    color: white;
    border: 5px solid white;
}