* {
  font-family: Arial, Helvetica, sans-serif;
  font-size: x-large;
}
body, form, table, th, tr, td {
  background-color: ghostwhite;
  }
h1  {
  font-size: xx-large;
}
#formel {
  background-color: white;
  color: black;
  border-radius: 7px;
}
#ergebnis {
  background-color: lightgrey;
  color: black;
  border-radius: 7px;
}
button {
  width: 60px;
  height: 60px;
  font-size: 48px;
  text-align: center;
  vertical-align: middle;
  border-radius: 7px;
  color: white;
  border-color: black;  
}
#bRnd, #bCos, #bSin, #bTan, #bPi {
  width: 100px; 
  font-size: 30px;
  background-color: black;
}
#bPl1, #bPl2 {
  border: 0px;
}
#b0, #b1, #b2, #b3, #b4, #b5, #b6, #b7, #b8, #b9 {
  background-color: blue;
}
#bKlA, #bKlZ, #bPun, #bKom {
  background-color: darkblue;
}
#bPlu, #bMin, #bMal, #bDiv, #bHoc {
  background-color: grey;
  color: white;
}
#bLoe, #bZur {
  background-color: darkred;
}
#bErg {
  background-color: purple;
}
#bIst {
  background-color: green;
}
button:hover {
  cursor: pointer;
  border-color: red;
}