html,
body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    /* align-items: center; */
    background-color: lightblue;
    font-family: 'Roboto', sans-serif;
    margin: 0;
    height: 100%;
}

.mainContainer {
    flex-grow: 1;
    align-self: center;
    padding-top: 50px;
}

.calculator {
    display: flex;
    flex-direction: column;
    justify-content: center;
    background-color: darksalmon;
    border-style: solid;
    border-color: black;
    border-radius: 15px;
    gap: 10px;
    width: 350px;
    height: 500px;
    padding: 20px;
}

.calculator .screen {
    box-sizing: border-box;
    text-align: right;
    background-color: white;
    border-style: solid;
    border-color: black;
    border-radius: 15px;
    padding: 10px;
    word-wrap: break-word;
    word-break: break-all;
}

.calculator .screen .upperScreen {
    box-sizing: border-box;
    min-height: 20px;
    font-size: 18px;
}

.calculator .screen .upperScreen {
    box-sizing: border-box;
    min-height: 28px;
    font-size: 25px;
}

.calculator .screen .lowerScreen {
    box-sizing: border-box;
    min-height: 45px;
    font-size: 45px;
}

.keys {
    display: flex;
    justify-content: center;
    text-align: center;
    gap: 10px;
    flex-grow: 1;
}

.keys button {
    flex: 1;
    border-radius: 15px;
    font-size: 20px;
    padding: 5px;
}

/* FOOTER */
footer {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: white;
    font-size: 18px;
    gap: 10px;
    padding: 20px;
}

a {
    display: flex;
    justify-content: center;
    align-items: center;
    color: black;
    font-weight: 550;
    gap: 10px;
    margin: 0px;
    padding: 0px;
    text-decoration: none;
}

.github-icon {
    width: 30px;
    height: 30px;
}