/******************************************
/* CSS
/*******************************************/

/* Box Model Hack */
*{
    box-sizing: border-box;
  }

/******************************************
/* BASE STYLES
/*******************************************/
body{
  background-image: url(mathematicspic1.png);
  height: 100%; 
  width: 100%;
}


/******************************************
/* LAYOUT
/*******************************************/
header{
  text-align: center;
  font-family: 'Gluten', cursive;
  font-size: 2rem;
  margin-top: 3%;
}

.container{
  width: max-content;
  margin: auto;
  background-color: #131E3A;
  padding: 5%;
  border-radius: 10%;
}

.calculator__display{
  width: 100%; 
  background-color: white;
  height: 75px;
  font-family: 'Gluten', cursive;
  font-size: 4rem;
  display: flex;
  justify-content: flex-end;
  margin-bottom: 10%;
}

.calculator__keys{
  max-width: 400px;
  display: flex;
  flex-wrap: wrap;
}

button{
  flex: 1 25%;
  height: 75px;
  font-size: 2.5rem;
  font-family: 'Gluten', cursive;
  border-radius: 50%;
}
.key--equal{
  border-radius: 5%;
  margin-top: 3%;
}




/******************************************
/* ADDITIONAL STYLES
/*******************************************/