*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    font-family:Arial,Helvetica,sans-serif;
    background:#f5f7fa;
    color:#2d3748;
}

header{
    background:#1f2937;
    color:white;
    padding:60px 20px;
    text-align:center;
}

main{
    max-width:900px;
    margin:40px auto;
    padding:20px;
}

section{
    margin-bottom:40px;
}

h1{
    font-size:42px;
    margin-bottom:20px;
}

h2{
    margin-bottom:15px;
}

p{
    line-height:1.8;
    margin-bottom:15px;
}

footer{
    text-align:center;
    padding:30px;
    color:#666;
    border-top:1px solid #ddd;
    margin-top:50px;
}