body {
  background-color: black;
  color: white;
  font-family: "consolas", "Courier New", monospace;
}
header{
  background-color: rgb(20, 20, 20);
  font-family: "consolas", monospace;  
  position: relative;
  height: 100px;
  text-align: left;
}
.logo{
  position: absolute;
  left: 20px;
}
.title {
  color: white;
  font-family: "consolas", monospace;
  font-size: xx-large;
  margin-left: 130px;
  text-decoration: none;
}
.subtitle {
  color: white;
  margin-left: 130px;
  text-decoration: none;
}
.navbar {
  text-decoration: none;
  display: flex;
  position: absolute;
  left: 15px;
}
.navbar ul {
  display:block;
  list-style-type: none;
  padding: 0;
  margin: 0;
  text-align: left;
}
.navbar li{
  padding: 10px;
  text-align: left;
  float: left;
}
.s1 {
  background-color: white;
  color: black;
}
.s1:hover{
  background-color: grey;
  color: white;
}
.s2:hover{
  background-color: rgb(50, 10, 10);
  color: white;
}
.s2 {
  background-color: rgb(25, 25, 25);
  color: white;
  text-decoration: none;
}
main{
  text-align: left;
  margin-left: 170px;
  max-width: 800px;
}
footer{
  text-align: center;
  background-color:rgb(25, 25, 25);
}
.mail{
  color: skyblue;
}