:root {
    --primary-background-color: #F8F9FA;
    --display-background-color: #E9ECEF;
    --button-background-color: #495057;
    --button-text-color: #FFFFFF;
    --operators-color: #4C93B3;
    --equal-color: #E69247;
}

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

    font-family: "Poppins", sans-serif;
    font-weight: 300;
}

body {
    background-color: var(--primary-background-color);
    text-align: center;
}

h1 {
    margin-bottom: 10px;
}

button {
    cursor: pointer;
    background-color: var(--button-background-color);
    color: var(--button-text-color);
    border: none;
    font-size: 1.2rem;
}

button:hover {
    filter: brightness(0.9);
}

input {
    border: 1px solid gray;
    grid-column: span 4;
    text-align: end;
    font-size: 2rem;
    padding: 15px;
    border-top-left-radius: 30px;
    border-top-right-radius: 30px;
}

.wrapper {
    display: grid;
    place-items: center;
    height: 100vh;
    width: 100%;
}

.calculator {
    display: grid;
    grid-template-columns: repeat(4, 80px);
    grid-template-rows: repeat(6, 80px);
    row-gap: 1px;
    column-gap: 1px;
}

#clear {
    grid-column: span 2;
}

#zero {
    grid-column: span 2;
    border-bottom-left-radius: 30px;
}

.operator {
    background-color: var(--operators-color);
}

#equal {
    background-color: var(--equal-color);
    border-bottom-right-radius: 30px;
}