body {
    display: flex;
    flex-direction: column;
    background-color: lightblue;
    text-align: center;
    font-size: x-large;
}

.headingOne {
    color: green;
    margin-bottom: 3px;
}

.input {
    margin-bottom: 10px;
}

.output {
    margin-bottom: 10px;
}

@media screen and (min-width:700px) {
    #input {
        padding: 4rem 6rem 4rem 6rem;
        margin-left: 5rem;
        margin-right: 5rem;
        font-size: x-large;
        border-radius: 1em;
        -webkit-border-radius: 1em;
        -moz-border-radius: 1em;
        -ms-border-radius: 1em;
        -o-border-radius: 1em;
    }
    #output {
        padding: 4rem 6rem 4rem 6rem;
        margin-left: 5rem;
        margin-right: 5rem;
        font-size: x-large;
        border-radius: 1em;
    }
    .dev {
        margin-top: 20px;
        padding: 0rem 10rem 0rem 10rem;
    }
    .btn {
        border-radius: 1em;
        background-color: rgb(129, 207, 129);
        color: white;
        padding: 1rem 2rem 1rem 2rem;
        font-size: 20px;
    }
}

@media screen and (max-width:699px) {
    #input {
        padding: 50px;
        margin: 0rem 1rem 0rem 1rem;
        font-size: x-large;
        border-radius: 1em;
    }
    #output {
        padding: 50px;
        margin: 0rem 1rem 0rem 1rem;
        font-size: x-large;
        border-radius: 1em;
    }
    .dev {
        margin-top: 20px;
        padding: 0rem 1rem 0rem 1rem;
    }
    .btn {
        margin-top: 20px;
        background-color: rgb(129, 207, 129);
        color: white;
        padding: 1rem 2rem 1rem 2rem;
        border-radius: 1em;
    }
}