body {
  padding:10px;
  font-family: sans-serif;
  line-height: 1.2;
  font-size: 1.3rem;
}

h1 {
  text-align:center;
}

p {
  font-size:1rem;
  color: grey;
  text-align:center;
  padding-bottom:1rem;
}

.calculator {
  padding:10px;
  min-width:350px;
  max-width:700px;
  margin:0 auto;
}

.calc-row {
  display:flex;
  background: #eaeaea;
  padding:15px;
  margin:5px;
  border-radius:5px;
}

.flex-left {
  flex:1;
}

.flex-right {
  flex:1;
}

input {
  width: 5rem;
  height: 25px;
  font-size: 1rem;
  padding: 2px 2px 0px 2px;
} 

input[type=button] {
  height: 1.95rem;
}

input#n1 {
  width:3rem
}

#showAnswer1,
#showAnswer2,
#showAnswer3 {
  padding: .375rem 1rem .22rem 1rem;
  background: #eeeeee;
  border: 1px solid grey;
  text-align: left;
  display: inline-block;
  min-width: 5rem;
}

footer p {
  text-align: center;
  font-size: 0.75rem;
  padding-top: 1rem;
  color: grey;
}

@media only screen and (max-width: 600px) {
  .calc-row {
    display:block;
  }

  input {
    margin-bottom: 1rem;
  }
}