* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;
    font-weight: 400;
    font-style: normal;
}

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

.container {
    position: relative;
    max-width: 300px;
    width: 100%;
    border-radius: 20px;
    padding: 10px 20px 20px;
    background: #080707f2;
    box-shadow: 0 5px 10px rgb(41, 41, 41);
    outline: #2e2e2e 10px solid;
}

.display {
    height: 90px;
    width: 100%;
    outline: none;
    border: solid 0.3;
    text-align: right;
    margin: 50px 0;
    font-size: 40px;
    color: #000000;
    pointer-events: none;
}

input {
    background: #a19c9c70;
    border-radius: 12px;
}

.button {
    display: grid;
    grid-gap: 12px;
    grid-template-columns: repeat(4, 1fr);
}

.button button {
    padding: 10px;
    border-radius: 45px;
    border: none;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    background: linear-gradient(#444444, #2C2C2C);
    transition: all 0.25s ease-in-out;
}

.button button:hover {
    background: linear-gradient(#2C2C2C, #444444);
}

.button button:active {
    transform: scale(0.94);
}

.operator {
    color: #e1e1e1;
}

button.opo {
    background: linear-gradient(#3A3A3A, #1F1F1F);
}

button.opo:hover {
    background: linear-gradient(#1F1F1F, #3A3A3A);

}

button.eq {
   background: linear-gradient(#007BFF, #0056B3);
}

button.eq:hover {
    background: linear-gradient(#0056B3, #007BFF);
}