body{font-family:Arial, sans-serif; margin:0; padding:0;}
nav{padding:10px; background:#e9ecef;}
nav a{margin-right:8px;}
main{padding:10px;}

header ,footer{
  background-color: rgb(69, 68, 68);
  color: #6f6868;
  text-align: center;
  padding: 20px;
  border-bottom: 3px solid #6f6b6b;
}