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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
    Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  display: flex;
  height: 100vh;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  row-gap: 30px;
}

.container {
  display: flex;
  flex-direction: column;
  row-gap: 10px;
}

.block {
  display: flex;
  column-gap: 10px;
  align-items: center;
}

button {
  width: 70px;
  height: 70px;
  border-radius: 15px;
  border: none;
  color: white;
  font-size: 1.5em;
  box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
}

.buttons {
  display: flex;
  column-gap: 15px;
}

.red {
  background-color: #e74c3c;
}

.red:hover {
  background-color: #c0392b;
}

.blue {
  background-color: #3498db;
}

.blue:hover {
  background-color: #2980b9;
}

.green {
  background-color: #1abc9c;
}

.green:hover {
  background-color: #16a085;
}

.result {
  font-size: 2em;
  font-weight: bold;
}