* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: #e9e2b8;
  font-family: helvetica, ariel, sans-serif;
}

.container {
  height: 80vh;
  display: grid;
  grid-template-columns: 20% 80%;
  grid-template-rows: 1fr 9fr;
  grid-template-areas:
    "navigate header"
    "navigate main";
  grid-column-gap: 2px;
  grid-row-gap: 2px;
}

.nav {
  position: fixed;
  width: 20%;
  height: 100%;
  background-color: rgb(0, 255, 255);
  grid-row: 1/3;
  grid-area: navigate;
  border: 1px solid grey;
}

.hdr {
  position: fixed;
  left: 20%;
  width: 80%;
  background-color: #00ff00;
  grid-area: header;
  border: 1px solid grey;
}

.main {
  margin-top: 2.4em;
  padding: 20px;
  background-color: rgb(255, 255, 0);
  grid-area: main;
  border: 1px solid grey;
}

.intro {
  padding: 5%;
}

.btn {
  background-color: rgb(235, 162, 162);
  border-radius: 20%;
  width: 300px;
  padding: 20px;
}