* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body {
    direction: rtl;
    background: url(./bg.jpeg);
    background-size: cover;
    background-repeat: no-repeat;
    display: flex;
    justify-content: center;
    align-content: center;
    flex-direction: column;
    align-items: center;
    flex-wrap: wrap;
    height: 100vh;
}
.calculator {
    width: fit-content;
    height: fit-content;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    align-content: stretch;
    flex-direction: column;
    background-color: white;
    border-radius: 5px;
    padding: 47px;
    box-shadow: 0px 0px 15px 0px rgb(90, 90, 90);
}

input[type="text"], #result,
button {
    padding: 10px;
    margin: 5px;
    background: #eeeeee;
    border: 1px solid #cbcbcb;
    border-radius: 5px;
}

button {
    padding: 5px 20px 5px 20px;
    border: 1px solid #cbcbcb;
    border-radius: 5px;
    font-weight: 600;
    font-size: 1rem;
    color: gray;
    font-family: system-ui;
    background: #eeeeee;
    transition: .3s;
}

button:hover {
    color: #323232;
    background: #d5d5d5;
    border: 1px solid #aaaaaa;

}

#result {
    margin-top: 10px;
    font-weight: bold;
}

.operations {
    margin-bottom: 10px;
}

.selected {
    background-color: #cbcbcb;
    border: 1px solid #aaaaaa;
    color: black;
}
.selected:hover {
    background-color: #cbcbcb;
}