* {
  box-sizing: border-box;
}
body {
  margin: 0 auto;
  background-color: #232323;
}
h1 {
  margin: 0 auto;
  color: white;
  padding: 10px 0;
  text-align: center;
  transition: color 1s, background-color 1s;
}
.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 1% 20px;
}
.square {
  float: left;
  width: 30%;
  height: 0;
  padding-bottom: 30%;
  background-color: lightblue;
  margin: 1.5%;
  border-radius: 20px;
  cursor: pointer;
  transition: background-color 1s;
}
#stripe {
  background-color: white;
  text-align: center;
  align-items: flex-start;
}
#message {
  color: black;
  width: 20%;
  padding: 6px 8px;
  font-size: 20px;
  font-weight: 500;
  text-align: center;
  display: inline-block;
}
button {
  color: #232323;
  font-weight: 600;
  font-size: 20px;
  background: white;
  border: none;
  padding: 6px 8px;
  cursor: pointer;
  text-transform: uppercase;
  transition: background 1s, color 1s;
}
#reset {
  width: 160px;
}
button:hover,
.selected {
  background-color: #232323;
  color: white;
}
@media screen and (max-width: 800px) {
  #stripe {
    align-items: baseline;
  }
  #message {
    display: block;
    width: auto;
  }
}