main.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: sans-serif;
}

.container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  display: flex;
}

.container section {
  min-width: 100%;
  height: auto;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: yellow;
}

.container section:nth-child(2) {
  background: rgb(228, 31, 31);
}

.container section:nth-child(3) {
  background: greenyellow;
}

.container section:nth-child(4) {
  background: royalblue;
}

.container section .content {
  max-width: 800px;
  padding: 40px;
  text-align: center;
}
.container section .content h2 {
  font-size: 4em;
  color: #111;
}

.container section .content p {
  font-size: 1.3em;
  line-height: 1.4em;
  color: #111;
}