* {
    margin: 0;
    padding: 0;

}

body {
 
    background-image: linear-gradient(to top, white,#505050);
    background-size: 100% 200%;
}

.wrapper-all {
    display: flex;
    justify-content: center;
}

button {
    width: 2.8em;
    height: 2.8em;
    font-size: 1.6em;
    border: none;
    font-weight: 600;
    margin: 0.1em;
    margin-bottom: 0.2em;

}

button:hover {
    cursor: pointer;
}

.button-zerro {
    width: 5.95em;
}

.wrapper {
    margin-top: 1em;
    background-color: black;
    border-radius: 1em;
    padding: 1em;
    width: 20em;

}

.color-operator {
    background-color: #3cff00;
    color: white;
}

.gray {
    background-color: #505050;
    color: white;
}

hr {
    width: 99%;
    margin-bottom: 1em;
}

.result {
    padding-top: 0.3em;
    color: black;
    width: 9.4em;
    margin: 0.2em;
    padding-right: 0.3em;
    min-width: 10.3em;
    min-height: 2.3em;
    font-size: 1.8em;
    overflow: hidden;
    word-wrap: break-word;
    display: block;
    text-align: right;
    font-weight: bold;
    border-radius: 10px;
    background-image: linear-gradient(to top, white, #3cff00);
    background-size: 10% 200%;

}