p{
    margin:0
}

.calc{
    position: relative;
    background: #e6e6e6;
    margin: 50px auto;
    width: 314px;
    height: 388px;
    border: 1px solid #a0a0a0;
    box-shadow: 0 0 10px #a0a0a0;
    /* font-family: Arial; */
    
    padding: 4px;
}

.calc-big-screen{
    display: grid;
    height: auto;
    margin-top: 5px;
    align-items: center;
    justify-content: end;
    padding-right: 4px;
}

.calc-small-screen{
    display: grid;
    height: auto;
    margin-top: 23px;
    align-items: center;
    justify-content: end;
    padding-right: 4px;
}

.screen-small-font{
    font-size: 20px;
    color: #5c5c5c;
}

.screen-big-font{
    font-size: 30px;
}

.buttons{
    display: grid;
    position: absolute;
    grid-template-areas: 
    "percent ce c x"
    "expression-half expression-expression-root c division"
    "seven eight nine multiply"
    "one two three multiply"
    "plus-minus zero dot equal";
    grid-gap: 2px;
    bottom: 4px;
    
}

.btn{
    background: #fafafa;
    width: 75px;
    height: 46px;
    border: 1px solid #f0f0f0;
    text-align: center;
    line-height: 45px;
    font-size: 1.0rem;
    cursor: pointer;
    user-select: none;
    font-size: 20px;
}

.btn.bg-grey{
    background: #f0f0f0;
    
}

.btn.bg-grey:hover{
    background: #d5d5d5;
    border: 1px solid #bdbdbd;
}

.btn.bg-white:hover{
    background: #dfdfdf;
    border: 1px solid #cfcfcf;
}

.btn.bg-blue{
    background: #8abae0;
    border: 1px solid #8abae0;
}

.btn.bg-blue:hover{
    background: #4599db;
    border: 1px solid #418fcd;
}

.btn.expression-square{
    line-height: 35px;
}

.btn.expression-root{
    line-height: 45px;
}

.btn.expression-root span { 
    border-top: 1px solid #000;
}