body{font-family:Arial,sans-serif;background-color:#f0f0f0}header{background-color:#333;color:#fff;padding:20px}main{height:400px;overflow-y:scroll;padding:20px}footer{background-color:#eee;padding:20px}input[type=text]{flex:1;padding:10px;font-size:16px;border:none}button{background-color:#333;color:#fff;padding:10px 20px;border:none;cursor:pointer}