body{
    font-family: Arial, Helvetica, sans-serif;
    background-color: rgb(188, 225, 238);
}
header{
    background-color: rgb(165, 213, 229);
    border: 1px solid black;
}
main{
    text-align: center;
    width: auto;
}
section{
    padding: 15px;
    margin: 10px;
}
nav a{
    text-decoration: none;
}
table, th, td{
    border: 1px solid;
    margin: 0 auto;
}
th, td{
    padding: 5px;
}
ul{
   list-style: none;
}
button:hover{
    background-color: rgb(129, 184, 202);
}
footer{
    background-color: rgb(133, 184, 199);
    border: 1px solid black;
}