.button {
    width: 50px;
    height: 50px;
    font-size: 25px;
    margin: 2px;
    cursor: pointer;
    background: white;
    border-radius: 50%;
    font-weight: bold;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    border-style: none;
}

.button:hover{
    border-style:solid;
    border-color: black;
}

.screen, .history {
    display: flex;
    flex-direction: column;
}

.history{
    width: 220px;
    height: 15px;
    margin: 5px;
    font-size: 15px;
    text-align: right;
    border-style: none;
    color: #90caf9;
}

.screen{
    width: 220px;
    margin: 5px;
    font-size: 25px;
    text-align: right;
    border-style: none;
}

.calc{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
    background-color: white;
    border: 7px solid white;
    border-radius: 5px;
    box-shadow: 10px 10px 5px
}

html{
    background: linear-gradient(to right, #b33e6b, #3e55a8);
}