body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background: linear-gradient(#77b0e6, #0c234f);
  font-family:'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

.calculator {
  width: 260px;
  margin: auto;
  padding: 20px;
  background-color: #77b0e638;
  border: 2px solid rgba(0, 0, 0, 0.113);
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
}
#display{
    color: #ffffff;
  width: 97%;
  height: 40px;
  font-size: 20px;
  margin-bottom: 10px;
  text-align: right;
  padding-right: 10px;
  border: 1px solid #cccccc41;
  border-radius: 6px;
  background: #22364938;
}
.button{
    display: grid;
    grid-template-columns:  repeat(4, 1fr);
    gap: 10px;
  
}
.button button {
  height: 50px;
  font-size: 18px;
  border: none;
  color: #ffffff;
  background-color: #77b0e638;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

#operators{
    color: #ffffff;
    background-color: #5fa2e1c8;

}
#clear{
    color: #ffffff;
    background-color: #1e335a;

}
#answer{
    color: #ffffff;
    background-color: #1e335a;
}

.button button:hover{
    background-color: #1e335a68;
}
#clear:hover{
    background-color: #77b0e6;
}
#operators:hover{
    background-color: #1e335a68;

}   
#answer:hover{
    background-color: #77b0e6;
}