* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

body {
    background-color: #0a090a;
    color: #ffffff;
}

main {
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    max-width: fit-content;
    width: 600;
    margin: 17% auto;
}

.container h1 {
    font-size: 45px;
    font-weight: 900;
    text-align: center;
}

.display {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    background-color: #fff;
    color: #333;
    margin-top: 50px;
    margin-bottom: 30px;
    padding: 16px 16px;
    border: 4px;
}

.display input {
    font-size: 20px;
    border: 0;
    outline: none;
}

i {
    font-size: 30px;
    color: red;
    transition: all .3s;
}

i:hover {
    color: #000;
}

button {
    background-color: #5c5a5a;
    color: #ffffff;
    font-size: 24px;
    font-weight: 700;
    padding: 14px;
    border: 0;
    outline: none;
    border-radius: 4px;
    margin: auto 40%;
    border: 1px solid #726f6f;
    transition: all .5s;
}

.container button i {
    font-size: 24px;
    font-weight: 700;
    padding: 24px;
}

button:hover {
    background-color: #ffffff;
    color: #000;
    border: 1px solid #fff;
}