html {
    width: 100%;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
    vertical-align: middle;
    white-space: nowrap;
}

.card {
    width: 300px;
    margin: 30px;
    border: .5px solid rgb(39, 39, 39);
    border-radius: 10px;
    color: white;
    background-color: rgb(39, 39, 39);
}

.display {
    background-color: rgb(39, 39, 39);
    height: 90px;
    border-radius: 10px 10px 0px 0px;
    text-align: right;
    bottom: 0px;
    font-size: 45pt;
    font-weight: 200;
    padding: 10px;
}

p {
    padding: 0px;
    margin: 0px;
    line-height: 0px;
}

.buttons {
    display: grid;
    grid-template-columns: 25% 25% 25% 25%;
    text-align: center;
    font-size: 30pt;
    font-weight: 500;
    user-select: none;    
    border-radius: 0px 0px 10px 10px;
    font-weight: 300;
}

.button {
    border: .5px solid rgb(39, 39, 39);
    border-radius: 0px;
    padding: 0px;
}

.button:active,
.button.active {
    background-color: rgb(99, 99, 99);
}

.top {
    background-color: rgb(51, 51, 51);
}

.num {
    background-color: rgb(77, 77, 77);
}

.oper {
    background-color: rgb(233, 140, 0);
}

.lwrL {
    grid-column-start: 1;
    grid-column-end: 3;
    border-radius: 0px 0px 0px 10px;
}

.lwrR {
    border-radius: 0px 0px 10px 0px;
}

#clear {
    letter-spacing: 0em;
}

#hidden {
    visibility: hidden;
    width: min-content;
    white-space: nowrap;
}