style.css

* {
    font-family: monospace, serif;
    color: white;
    user-select: none;
}

body {
    background-color: #36393F;
}

.container {
    position: absolute;
    left: 50%;
    top: 50%;
    translate: -50% -50%;
}

.question {
    text-align: center;
    text-shadow: 0 0 20px #538bff;
    user-select: text;
}

.show-answer {
    position: absolute;
    top: -100px;
    left: 50%;
    translate: -50%;
    cursor: pointer;
    transition: text-shadow .5s, scale .5s;
}

.show-answer:hover {
    text-shadow: 0 0 20px #538bff;
    scale: 1.05;
}

.back {
    position: absolute;
    top: -150px;
    left: 50%;
    translate: -50%;
    cursor: pointer;
    transition: text-shadow .5s, scale .5s;
}

.back:hover {
    text-shadow: 0 0 20px #538bff;
    scale: 1.05;
}

.back-main {
    position: absolute;
    top: -250px;
    left: 50%;
    translate: -50%;
    cursor: pointer;
    transition: text-shadow .5s, scale .5s;
}

.back-main:hover {
    text-shadow: 0 0 20px #538bff;
    scale: 1.05;
}

.exam-info {
    position: absolute;
    top: -220px;
    left: 50%;
    translate: -50%;
    cursor: pointer;
    transition: text-shadow .5s, scale .5s;
}

.options {
    display: flex;
    flex-wrap: wrap;
    margin-top: 15px;
}

.options > .option {
    display: flex;
    margin-left: 50px;
    margin-top: 20px;
}

.options > .option:first-child {
    margin-left: 0;
}

.options > .option > .option-name:first-child {
    border: 3px solid #538bff;
    padding: 5px;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    text-align: center;
    margin-top: -5px;
    margin-right: 5px;
    cursor: pointer;
    transition: filter .5s, scale .5s, background-color .5s;
}

.options > .option > .option-name:first-child:hover {
    scale: 1.1;
    filter: drop-shadow(0 0 20px #538bff);
}

.submit-answer {
    font-size: 20px;
    background: #538bff;
    width: max-content;
    position: absolute;
    bottom: -70px;
    left: 50%;
    translate: -50%;
    border-radius: 3px;
    padding: 10px;
    cursor: pointer;
    transition: filter .5s, scale .5s, background-color .5s;
}

.submit-answer:hover {
    scale: 1.1;
    filter: drop-shadow(0 0 20px #538bff);
}

.disabled {
    background: #737c88;
    cursor: not-allowed;
}

.disabled:hover {
    scale: 1;
    filter: none;
}

.main {
    margin-top: -200px;
}

.lessons {
    position: absolute;
    left: 50%;
    translate: -50%;
}

.lessons > .lesson {
    background-color: #538bff;
    padding: 10px;
    width: max-content;
    cursor: pointer;
    transition: filter .5s, scale .5s, background-color .5s;
    margin-left: 50%;
    translate: -50%;
    margin-bottom: 10px;
}

.lessons > .lesson:hover {
    scale: 1.1;
    filter: drop-shadow(0 0 20px #538bff);
}