body{
    font-family: Arial;
    margin:0;
    background:#f5f5f5;
}

header{
    background:#0077cc;
    color:white;
    text-align:center;
    padding:20px;
}

nav{
    background:#333;
}

nav ul{
    list-style:none;
    display:flex;
    margin:0;
    padding:0;
}

nav ul li{
    padding:15px;
}

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

main{
    width:70%;
    float:left;
    padding:20px;
}

section{
    background:white;
    padding:20px;
    margin-bottom:20px;
    border-radius:8px;
}

aside{
    width:22%;
    float:right;
    margin:20px;
    padding:20px;
    background:white;
    border-radius:8px;
}

footer{
    clear:both;
    background:#222;
    color:white;
    text-align:center;
    padding:15px;
}

button{
    padding:10px;
    background:#0077cc;
    color:white;
    border:none;
    cursor:pointer;
}

button:hover{
    background:#005fa3;
}

input{
    padding:10px;
    width:250px;
}

div{
    margin-top:15px;
    padding:10px;
    background:#eef;
}