style.css

* {
    margin: 0;
    padding: 0;
    font-family: Tahoma, Verdana, sans-serif
}

header {
    margin: 8vh auto;
    text-align: center;
}

h1 {
    font-size: 13vh;
    color: #ffffff;
    -webkit-text-stroke: 4px #726557;
}

p {
    font-size: 2vh;
}

body {
    background-color: #B6A795;
}

.container {
    background-color: #726557;
    margin: 0 auto;
    padding: 2vh 5vh 5vh 5vh;
    max-width: 800px;
}

.options-wrapper {
    margin-bottom: 2vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.options-text {
    font-size: 1rem;
    color: #ffffff;
}

.textbox-text {
    font-size: 1.5rem;
}

.statistics {
    display: flex;
    justify-content: flex-end;
}

.text-wrapper {
    position: relative;
    background-color: #ffffff;
    text-align: justify;
    word-break: break-all;
    padding: 3vh;
    min-height: 13vh;
}

.blur {
    filter: blur(3px);
}

.overlay-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3.5vh;
    font-weight: bold;
    color: #ffffff;
    -webkit-text-stroke: 2px #726557;
}

.disable {
    display: none;
}

input[type="checkbox"] {
    height: 15px;
    width: 15px;
    vertical-align: middle;
    position: relative;
    bottom: 2px;
}

/* Hide text input */
input[type="text"] {
    position: absolute;
    left: -100vw;
}


span {
    display: inline-block;
    text-align: center;
    font-weight: bold;
    min-width: 1rem;
    min-height: 2rem;
    margin: 0.1rem;
}

.correct {
    border-bottom: 0.2rem solid;
    color: green;
}

.incorrect {
    border-bottom: 0.2rem solid;
    color: red;
}

.current {
    border-bottom: 0.2rem solid gray;
}