*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.calculator{
    height: 400px;
    width: 700px;
    background: rgb(78, 78, 78);
    margin: 50px auto;
    border: 2px solid rgb(41, 41, 41);
    border-radius: 4px;
}
.cal-parts{
    height: 60vh;
    width: 98.5%;
    margin: 5px auto;
    background: rgb(235, 235, 235);
    align-content: center;
    text-align: center;
}
.calculator>.cal-parts>input{
    height: 90px;
    width: 100%;
    font-size: 44px;
    text-align: right;
    padding: 0 10px;
    outline: none;
    border: none;
    background: rgb(235, 235, 235);
}
.calculator>.cal-parts>input:focus{
    cursor: pointer;
    background: rgb(240, 240, 240);
}
.cal-buttons{
    height: 44vh;
    width: 100%;
    margin: 10px auto;
    padding-left: 2px;
}
.calculator>.cal-parts>.cal-buttons{
    display: grid;
    grid-template-columns: repeat(4, 169px);
    grid-template-rows: repeat(4, 55px);
    flex-wrap: wrap;
    gap: 2px;
}
.calculator>.cal-parts>.cal-buttons>button{
    font-size: 24px;
    font-weight: 600;
    border-radius: 5px;
    border: 1px solid gray;
    background: white;
}
.calculator>.cal-parts>.cal-buttons>button:hover{
    background-color: rgb(219, 219, 219);
}
.calculator>.cal-parts>.cal-buttons>button:active{
    background-color: rgb(194, 194, 194);
}
button#equal{
    width: 340px;
    background: rgb(88, 223, 88);
}
button#equal:hover{
    background-color: rgb(67, 187, 67);
}
button#equal:active{
    background-color: rgb(51, 153, 51);
}
/* =============================================================================================== */