body{
    
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    background-color: rgb(25, 25, 26);
}

h1{
    color: aliceblue;

}

.calculator{
    background-color: white;
    width: 300px;
    border-radius: 10px;
    padding: 20px;

}

#display {
    width: 100%;
    height: 50px;
    font-size: 24px;
    text-align: right;
    border: none;
    border-radius: 5px;
    padding: 5px;
    margin-bottom: 10px;
    background-color: #f0f0f0;
    box-sizing: border-box;
}

.box-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr 1fr 1fr;
    gap: 10px;
}

button {
    height: 60px;
    font-size: 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

button:hover {
    background-color: #e0e0e0;
    cursor: pointer;
    transition: .9s;
    

}

.btn-zero{
    grid-column: 1 / 3;
}

.btn-result{
    grid-row: 4 / 6;
    grid-column: 4;
    height: 100%;
}
.btn-result:hover {
    background-color: #c2c2c2;
}

#button:hover{
    background-color: #969696;
    transition: background-color 0.2s, transform 0.1s;
}

#sub-tittle {
    text-align: center;
}

.tittle{
    text-align: center;
}