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

h1 {
  margin-top: 0;
  margin-bottom: 15px;
  text-align: center;
  font-size: 2.5rem;
  color: #333;
}

.container {
  margin: 0 auto;
  padding: 20px;
  width: 900px;
  background-color: aquamarine;
}
.container .buttons {
  display: flex;
  justify-content: space-around;
  width: 100%;
}

.container .buttons button {
  margin-bottom: 5px;
  width: 100px;
  height: 40px;
  padding: 0;
  background: lightcoral;
  border-radius: 17px;
  font-size: 1rem;
  color: #333;
  margin-top: 0;
}

.container .screen {
  display: grid;
  width: 800px;
  height: 430px;
  border: 7px solid lightcoral;
  margin: 15px auto;
  border-radius: 15px;
}

.footer {
  text-align: center;
  text-decoration: none;
  color: #333;
  font-family: 'Courier New', Courier, monospace;
  text-decoration-color: #333;
  font-weight: 900;
}