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

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

:root {
    --primary-button:#ff9500;
    --secondary-button:#333333;
    --input-color : #272727;
}

.calculator {
    width: 370px;
    padding: 15px 20px;
    border-radius: 8px;
    background-color:#ffffff;
    box-shadow: 0px 2px 24px 1px #272727;
}

input {
    width: 100%;
    height: 60px;
    margin-bottom: 8px;
    background-color: var(--input-color);
    text-align: right;
    color: #ffffff;
    font-size: 32px;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4 , 1fr);
    gap: 10px;
}

button {
    width: 75px;
    height: 75px;
    cursor: pointer;
    background-color: var(--secondary-button);
    font-size: 24px;
    border-radius: 6px;
    border: none;
    box-shadow: 0 2px 0 rgba(0,0,0,0.03);
    transition: all 0.1s ease-in-out;
}

button:hover {
    background-color: #444444;
}

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

.operator:hover {
    background-color:#ffae3d ;
}

.span {
    grid-column: 1 / 3; 
    width: 95%;
}