body{
    background-color: blue;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: 'Gill Sans', 'Gill Sans MT','Trebuchet MS', sans-serif;
}
.calculator{
    background: rgb(238, 4, 187);
    padding: 20px;
    border-radius: 10px;
    width: 260px;
}
#display{
    width: 100%;
    height: 50px;
    background: black;
    color: rgb(6, 246, 6);
    font-size: 2rem;
    text-align: right;
    margin-bottom: 10px;
    border: none;
    border-radius: 6px;
    padding-right: 10px;
}
.buttons{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
}
button{
    padding: 20px;
    font-size: 1.2rem;
    border: 3px solid rgb(251, 5, 5);
    border-radius: 6px;
    cursor: pointer;
    background: #14ff4f;
    color: #f70b0bb7;
    font-weight: bold;
}
button:hover{
    background: #07a12e;
}
.btn-operator{
    background: rgb(194, 248, 1);
}
.btn-operator:hover{
    background: rgb(147, 186, 5);
}
.btn-equal{
    background: rgb(194, 248, 1);
    grid-column: span 4;
}
.btn-equal:hover{
    background: rgb(147, 186, 5);
  
}