styles.css

:root {
    --text-color: #fff;
    --primary-color: hsl(201, 100%, 17%);
    --secondary-color: hsl(201, 100%, 27%);
}

body {
    display: flex;
    position: relative;
    flex-direction: column;
    gap: 1rem;
    padding: 4rem 2rem;
    background-color: var(--primary-color);
    font-family: sans-serif;
}

.button-wrapper {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
    justify-content: center;
    gap: 2rem;
}

.tinput {
    color: var(--text-color);
}

::placeholder {
    /* Chrome, Firefox, Opera, Safari 10.1+ */
    color: var(--text-color);

    opacity: .5;
    /* Firefox */
}

:-ms-input-placeholder {
    /* Internet Explorer 10-11 */
    color: var(--text-color);
}

::-ms-input-placeholder {
    /* Microsoft Edge */
    color: var(--text-color);
}

.character-input {
    background: transparent;
    width: 1.8ch;
    padding: 5px 0;
    text-align: center;
    font-size: 3rem;
    border: 0;
    color: var(--text-color);
    border-bottom: 2px solid var(--text-color);
    outline: none;
}

.top-button {
    font-family: inherit;
    font-size: 2rem;
}

.top-buttons-container {
    position: absolute;
    top: 0;
    left: 0;
    padding: 0.5rem;
}

.wrapper {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin: auto;
    padding: 4rem 0;
    gap: 2rem;
}

.flex-wrapper {
    display: flex;
}

.word-wrapper {
    display: flex;
    gap: 0.5rem;
}

#sentence {
    background: transparent;
    border: none;
    text-align: center;
    font-size: 2rem;
    outline: none;
    resize: none;
}

#result {
    font-size: 3rem;
    color: var(--text-color);
    display: none;
    text-align: center;
}

.textarea-wrapper {
    display: flex;
    align-items: center;
    gap: 2rem;
    flex-direction: column;
}

#revealresult {
    display: none;
}

/* CSS */
.btn {
    appearance: button;
    backface-visibility: hidden;
    background-color: var(--secondary-color);
    border-radius: 6px;
    border-width: 0;
    box-shadow: rgba(50, 50, 93, 0.1) 0 0 0 1px inset,
        rgba(50, 50, 93, 0.1) 0 2px 5px 0, rgba(0, 0, 0, 0.07) 0 1px 1px 0;
    box-sizing: border-box;
    color: var(--text-color);
    cursor: pointer;
    font-family: -apple-system, system-ui, "Segoe UI", Roboto,
        "Helvetica Neue", Ubuntu, sans-serif;
    font-size: 100%;
    height: 44px;
    line-height: 1.15;
    outline: none;
    overflow: hidden;
    padding: 0 25px;
    position: relative;
    text-align: center;
    text-transform: none;
    transform: translateZ(0);
    transition: all 0.2s, box-shadow 0.08s ease-in;
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
}

.btn:disabled {
    cursor: default;
}

.btn:focus {
    box-shadow: rgba(50, 50, 93, 0.1) 0 0 0 1px inset,
        rgba(50, 50, 93, 0.2) 0 6px 15px 0, rgba(0, 0, 0, 0.1) 0 2px 2px 0,
        rgba(50, 151, 211, 0.3) 0 0 0 4px;
}