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button:hover {
    background-color: lightgray;
}

button {
    border-radius: 12px;
    background-color: DarkSeaGreen;
    font-size: 20px;
    padding: 10px;
    border: 1px solid black;
}

.operator {
  background-color: Linen;
}

p {
   border: 1px solid black;
   width: 150px;
   /*height: 60px;*/
   background-color: DarkSeaGreen;
   text-align: right;
   font-size: 40px;
   line-height: 60px;
   vertical-align: middle;

}