*,
*::before,
*::after {
    box-sizing: border-box;
    font-family: Cambria, Cochin, Georgia, Times, 'Times New Roman', serif font-weight: normal;
}

* {
    padding: 0;
    margin: 0;
}

body {
    background: url(./WallpaperDog-5439843.jpg) no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}

.calc {
    display: grid;
    justify-content: center;
    align-content: center;
    min-height: 100vh;
    grid-template-columns: repeat(4, 100px);
    grid-template-rows: minmax(120px, auto) repeat(5, 100px);
}

.calc>button {
    cursor: pointer;
    font-size: 2.5rem;
    border: 4px ridge #eedfdc;
    outline: none;
    background: rgb(190, 181, 181);
    color: rgba(54, 46, 99, 0.884);
    border-radius: 2px
}

.calc>button:hover {
    background: pink;
    border: 3px inset rgb(8, 24, 170);

}

.span2 {
    grid-column: span 2;
}

.screen {
    grid-column: 1 / -1;
    background-color: rgba(107, 104, 104, 0.75);
    color: white;
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    flex-direction: column;
    padding: 10px;
    word-wrap: break-word;
    word-break: break-all;
    border: 5px groove #e9dcee;
    border-radius: 30px 30px 0px 0px;
}

.screen .previousOperand {
    color: rgb(221, 181, 188);
    font-size: 1.7rem;
}

.screen .currentOperand {
    color: rgb(139, 187, 179);
    font-size: 2.7rem;
}

#bottomleft {
    border-radius: 0px 0px 0px 30px;
}

#bottomright {
    border-radius: 0px 0px 30px 0px;
}