* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    /* border: 0.5px solid red; */
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    gap: 50px;
    font-family: 'Roboto Mono', monospace;
}
.calculator {
    height: 500px;
    width: 400px;
    border: 1px solid black;
    background-color: rgb(154, 152, 152);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-evenly;
    border-radius: 10px;
}

.screen {
    width: 92%;
    padding-right: 4px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    background-color: rgb(63, 62, 62);
    color: white;
    font-size: 64px;
    overflow: hidden;
    border: 3px solid black;
}

.button-list{
    width: 92%;
    height: 75%;
    list-style-type: none;
    display: flex;
    flex-wrap: wrap;
}

.button-list li {
    height: calc(20%);
    width: calc(25%);
}

.operatorBtn,
.numberBtn {
    height: 100%;
    width: 100%;
    border-radius: 20px;
    cursor: pointer;
}

.operatorBtn:hover,
.numberBtn:hover {
    opacity: 0.5;
}


.numberBtn {
    background-color: rgb(72, 129, 103);
}
.operatorBtn {
    background-color: rgb(230, 127, 43);
}

.button-list li.zeroBtn {
    flex-grow: 2;
}