body {
      font-family: Arial, sans-serif;
      margin: 0;
      padding: 0;
    }


.header img {
  
  background: #555;
}
p {
  color: black;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 100;
  overflow: hidden;
  background-color: #1a1a1a;
}

ul li {
  float: left;
}

ul li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 12px;
  text-decoration: none;
}

ul li a:hover {
  background-color: #c90000;
}
* {box-sizing:border-box}