@import url('https://fonts.googleapis.com/css?family=Montserrat:400,600');

body {
  font-family: 'Robert Sans', sans-serif;
  color: #2D3E50;
  margin: 0;
  padding: 0;
  overflow: hidden;
  text-align: center;
}

section {
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.video-wrap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: -1;
}

.video-wrap video {
  min-width: 100%;
  min-height: 100%;
}

.overlay {
  z-index: 1;
  height: 100%;
  width: 100%;
  top: 0;
  left: 0;
  background: #2D3E50;
  position: absolute;
  opacity: .4;
}

.container {
  background-color: brown;
  width: 250px;
  height: 380px;
  border-radius: 20px;
  border: 5px ridge silver;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

h1 {
  text-align: center;
  margin: auto;
  color: silver;
}

#display {
  display: block;
  height: 50px;
  width: 200px;
  text-align: right;
  margin: auto;
  font-size: 30px;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: 5px;
  width: 210px;
  height: 240px;
  justify-items: center;
  align-items: center;
  margin: 20px auto;
}

button {
  background-color: silver;
  font-size: 30px;
  color: brown;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

.button {
  display: inline-block;
  padding: 0;
  margin: 0;
  font-size: 30px;
  text-align: center;
  line-height: .7;
}

.button span {
  display: block;
}

.copy {
  color: black;
  text-align: center;
}

.hidden-storage {
  display: none;
}