* {
  position: relative;
}

html,
body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: sans-serif;
  width: 100vw;
  height: 100vh;
  background-color: #eee;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.wrapper {
  width: 200px;
  display: flex;
  visibility: hidden;
}

h1 {
  text-align: center;
}

.btn {
  cursor: pointer;
  width: 200px;
  height: 100px;
  background: #3cf;
  overflow: hidden;
}

.bar {
  width: 200px;
  height: 100px;
  background: #06c;
  position: absolute;
}

span {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100px;
  font-family: sans-serif;
  font-weight: bold;
  text-shadow: 1px 1px 3px #333;
  color: white;
  font-size: 24px;
}