*{
  font-family: 'Courier New', Courier, monospace;
}

body{
  background-color: white;}

header{
  background-color:  #64C2EC;
  border-radius: 15px}

  /* Links */

a:link, a:visited{
  background-color: #000000;
  border: 3px solid rgb(125, 125, 125);
  border-radius: 20px;
  color: rgb(255, 255, 255);
  padding: 15px 25px;
  text-align: center;
  text-decoration: none;
  display: inline-block;}

a:hover, a:active{
  background-color: grey;
  text-decoration:underline;
  padding: 15px 25px;}


  /* Javascript collapsible */

.collapsible{
  background-color: #64C2EC;
  color: black;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: right;
  outline: none;
  font-size: 20px;}

.active, .collapsible:hover{
  background-color: cyan;}

.collapsible:after{
  content: '\02795'; 
  font-size: 13px;
  color: white;
  float: right;
  margin-left: 5px;}

.active:after{
  content: "\2796";}

.content{
  padding: 0 18px;
  display: none;
  overflow: hidden;
}


  /* Text */

h1{
  font-family: 'Courier New', Courier, monospace;
  font-weight: bold; 
  margin: 10px;
  padding: 20px;}

h2{
  font-size: 28px;}

h3{
    font-size: 18px;}

p{
  font-size: 18px;}

nav{
  display: flex;
  justify-content: space-between;}