* {
    margin: 0;
    padding: 0;
}

body {
    font-family: sans-serif ;
}

header {
    background-color: aquamarine;
    padding: 15px 25px;
    box-sizing: border-box;
    display: flex;
    justify-content: space-between;
    align-items: center ;
}

header nav ul {
    list-style: none;
}

header nav ul li{
    display: inline-block;
    margin-left: 20px;
}

header nav ul li a{
    color: black;
    text-decoration: none;
}

header nav ul li a:hover{
    text-decoration: underline;
}

main {
    height : calc(100vh -(100px + 40px)) ;
    padding: 50px 25px;
    box-sizing: border-box;
}

section {
    width: 100%;
    max-width: 800px;
    box-shadow: 0 0 10px 0 grey;
    padding: 15px;
    box-sizing: border-box;
    border-radius: 10px;
}

p{
    font-size:2em;
    margin-bottom:50px;
    font-family: arial, sans-serif;
}
#RN{
    margin-top: 10px;
    font-size:3em;
    color: rgb(255, 0, 0);
    font-family: arial, sans-serif;
    font-weight: bold;
}

a{
    font-family: Arial, sans-serif;
    color: black;
    text-decoration: none;
    text-decoration: underline;
}