@import url('https://fonts.googleapis.com/css?family=Muli&display=swap');

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

body {
  background-color: #383838;
  font-family: 'Muli', sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
  padding: 20px;
  color: white;
}

#insert {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.key {
  border: 1px solid #999;
  background-color: #2B2B2B;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
  padding: 20px;
  min-width: 140px;
  flex: 1 1 150px;
  font-size: 18px;
  font-weight: bold;
  position: relative;
  border-radius: 10px;
}

.key small {
  position: absolute;
  top: -20px;
  left: 0;
  width: 100%;
  font-size: 14px;
  color: #c4c4c4;
}