styles.css

body {
    background-color: cornsilk;
    color: midnightblue;
    display: flex;
    font-family: AppleGothic, Ariel, Helvetica, sans-serif;
    font-size: 32px;
    justify-content: center;
    margin-top: 5%;
    text-align: center;
}

.wrapper>h1 {
    font-size: 6rem;
    margin: 5rem 0 0 0;
    transition: all 0.4s;
    position: relative;
}

.recursions {
    width: 100%;
}

.fibNoRecursionButton,
.fibRecursionButton,
.clearButton {
    background-color: ivory;
    border-radius: 10px;
    box-shadow: 10px 5px 5px lightblue;
    margin: 2% 5%;
    padding: 0.25rem;
    height: auto;
    width: 60%;
}

.fibRecursionButton {
    width: 53%;
}

.clearButton {
    width: 20%;
}

.buttonText {
    color: darkblue;
    font-size: 2.25em;
    padding: 2%;
}

.fibNoRecursionResult>textarea,
.fibRecursionResult>textarea {
    background-color: ivory;
    color: midnightblue;
    font-family: AppleGothic, Ariel, Helvetica, sans-serif;
    font-size: 1.75rem;
    margin: 0 auto;
    padding: 1em;
    height: 6.5rem;
    width: 50%;
    transition: all 0.35s ease-in-out;
}