.container {
    height: 480px;
    width: 400px;
    border-radius: 10px;
    border: solid black;
    background-color:gray;
    margin:auto;
    box-shadow:         3px 3px 5px 6px #ccc;  
  }

.buttons {
    padding: 20px;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 15px;
}

.button {
    opacity: .5;
    border: 1px solid black;
    background-color: aqua;
    padding: 10px;
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 1.7;
    text-align: center;
    box-shadow:         4px 4px 4px 4px #ccc;
    
}

.button:hover {
    opacity: .9;
    border: 1px solid black;
    background-color: aqua;
    padding: 10px;
    font-size: 1.1rem;
    font-weight: 550;
    line-height: 1.7;
    text-align: center;
    box-shadow:         4px 4px 4px 4px #ccc;
    
}


.calc-display {
    font-size: large;
    font-weight: 500;
    opacity: .5;
    border: 1px solid black;
    background-color:white;
    margin: auto;
    margin-top:10px;
    margin-bottom:10px;
    height:40px;
    width: 300px;
    padding-right: 5px;
    justify-content: end;
    align-content: center;

    display:grid;
    grid-column: span 4;
    box-shadow:         4px 4px 4px 4px #ccc;
  }


.equal {
    opacity: .5;
    border: 1px solid black;
    background-color: aqua;
    padding: 10px;
    font-size: 1.2rem;
    font-weight: 500;
    line-height: 1.7;
    text-align: center;

    display:grid;
    grid-column: span 2;
    box-shadow:         3px 3px 5px 6px #ccc;
    
}

.equal:hover {
    opacity: .9;
    border: 1px solid black;
    background-color: aqua;
    padding: 10px;
    font-size: 1.2rem;
    font-weight: 500;
    line-height: 1.7;
    text-align: center;

    display:grid;
    grid-column: span 2;
    box-shadow:         3px 3px 5px 6px #ccc;
    
}

/* .item:nth-child(1) {
    font-size: 1.1rem;
    grid-row: span 2;
    display: grid;
    align-content: center;
} */