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

body {
  font-family: Arial, Helvetica, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2rem;
}

.container {
  width: 600px;
  padding: 1rem;
}

.header-group,
.text-input,
.output,
#click-btn {
  width: 100%;
  margin-bottom: 1rem;
}

.header-group {
  display: flex;
  align-items: center;
}

.header-group > h1 {
  font-size: 3rem;
}

.header-group > img {
  width: 100px;
  margin-right: 1rem;
}

.text-input > input {
  width: 100%;
  height: 3rem;
  padding: 10px;
  margin-top: 1rem;
  font-size: 2rem;
}

.text-input > input::placeholder {
  font-size: 1.5rem;
}

.btn {
  width: 100%;
  height: 3rem;
  font-size: 1.5rem;
  background-color: rgba(71, 61, 139, 0.828);
  color: white;
  border-radius: 5px;
  transition: ease-in;
}

.output {
  background-color: lightgoldenrodyellow;
  font-size: 1rem;
  padding: 2rem;
}

#click-btn:hover {
  transform: translateY(-5px);
}

.keys {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.keys > div {
    font-size: 4rem;
    border: 1px solid darkblue;
    border-radius: 5px;
    width: auto;
    text-align: center;
} 
