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

body{
    font-family: 'Helvetica',"Arial",sans-serif;
    color: #5D6063;
    font-size: 16px;
    line-height: 1.3;
    text-align: center;
    margin: 0;
  }

.counter {
  display: flex;
  justify-content: center;

  padding-top: 1em;

}

.counter >button{
 padding: 20px 30px 20px 30px;
  margin: 20px 20px 20px 20px;
  font-size: 20px;
  color: white;
  border-radius: 5px;
}

#buttonPlus{
  background-color: green;
}

#buttonMinus{
  background-color: red;
}

.counter > input{
  text-align: center;
  font-size: 20px;
}

.reset > button{
  padding: 30px 20px 30px 20px;
   margin: 20px 20px 20px 20px;
   color: white;
   font-weight: bold;
   border-radius: 5px;
}

#buttonReset{
  background-color: #407FC7;
}