:root {
  --primary-color: rgba(13, 110, 139, 0.75);
  --secondary-color: rgba(229, 148, 0, 0.9);
  --overlay-color: rgba(24, 39, 51, 0.85);
  --menu-speed: 1s;
  --main-white: #fff;
  --main-dark: #333;
}

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

body {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  line-height: 1.4;
}

.container {
  max-width: 960px;
  margin: auto;
  overflow: hidden; /* remove scroll bars */
  padding: 0 3rem;
}

#showcase {
  background-color: var(--primary-color);
  color: var(--main-white);
  height: 100vh;
  position: relative; /* using :before pseudo to add overlay which will be absolute */
}

#showcase::before {
  content: "";
  background: url("https://source.unsplash.com/user/erondu/daily") no-repeat
    center center/cover;
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  z-index: -1; /* move background picture to back */
}

.showcase-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: inherit; /* inherit from parent (#showcase) which is 100vh */
}

#showcase h1 {
  font-size: 4rem;
}

#showcase p {
  font-size: 1.5rem;
  margin: 2rem 0;
}

.btn {
  display: inline-block;
  text-decoration: none;
  background: var(--primary-color);
  color: var(--main-white);
  padding: 1rem 2rem;
  border: none;
  transition: all 1s ease-in-out;
}

.btn:hover {
  background: #333;
  transform: scale(1.5) rotateZ(360deg);
  opacity: 0.75;
}