body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 90vh;
    background-color: #000000;
    overflow: hidden;
}

#container {
    height: 600px;
    width: 400px;
    border: 2px solid black;
    border-radius: 15px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 10px;
    background-color: #146C94;
    color: white;
}

#header {
    width: 350px;
    height: 20px;
    padding: 15px;
    font-size: 20px;
}

#screen {
    height: 50px;
    width: 350px;
    padding: 15px;
    font-size: 45px;
}

#button-container {
    height: 400px;
    width: 350px;
    padding: 15px;
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(5, 1fr);
}

.buttons {
    height: 70px;
    width: 70px;
    border-radius: 50%;
    border: 1px solid transparent;
    background-color: #F6F1F1;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 20px;
}

.buttons:active {
    background-color: rgb(208, 208, 208);
}

.buttons div {
    
    cursor: context-menu;
}

#zero {
    grid-row: 5/6;
    grid-column: 1/3;
    width: 160px;
    border-radius: 35px;
}