style.css

body {
    background-color: black;
    color: white; 
    font-family: arial;
    padding: 0px;
    margin: 0px;
}

.headerDiv {  
    padding: 5px;
    display: flex;
    background-color: rgb(14, 101, 112);
    
  }

.clogo {
    
    width: 10vmax;
    height: 10vmax;
    margin-right: 5%;
    margin-left: 5%;
  }

.htitle {
  
  margin-top: 1%;
  font-size: 90%;
}

.menu {
  text-align: center;
  padding: 10px;
  background-color: rgb(14, 101, 112);
}

.button {
  border-radius: 8px;
  cursor: pointer;
  width: auto;
  background-color: black;
  color: white;
  padding: 10px;
  margin-left: 1%;
  margin-top: 2px;
  margin-right: 1%;
  font-size: auto;
  transition-duration: 0.4s;
}

.button:hover {
  background-color: green;
  color: white;   
}

.pdiv {
  box-sizing: border-box;
}

.left, .right {
  box-sizing: border-box;
  float: left;
  width: 30%;
  height: 150vh;
  background-color: rgb(14, 101, 112);
}

.center {
  float: left;
  width: 40%;
  box-sizing: border-box;
}