quiz.css

@import url('https://fonts.googleapis.com/css2?family=Russo+One&display=swap');

#nav {
    transition: 700ms linear;
    opacity: 0;
    width: 0px;
    height: 100vh;
    background: black;
    position: absolute;
    top: 0;
    z-index: -1;
    color: black;
    z-index: 10;
    text-align: center;
    display: none;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

#openn {
    width: 100px;
    height: 100px;
    cursor: pointer;
    border: none;
    z-index: 99;
    background: black;
}

#nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
}

    #nav p a {
        font-size: 2.60em;
        cursor: pointer;
        transition: 0.5s;
        font-family: 'Russo one';
        white-space: no-wrap;
        color: white;
        text-decoration: none;
    }

        #nav p a:hover {
            color: red;
        }

*::selection {
    background: black;
    color: black;
}

#nav h1 {
    font-size: 4em;
    font-family: 'Russo one';
    white-space: no-wrap;
}

#nav p {
    margin-top: 70px;
    margin-bottom: 70px;
}

.line {
    width: 50%;
    height: 5px;
    background: black;
    margin: 5px;
    margin-left: 35%;
}

#nav button {
    border: none;
    font-size: 2em;
    width: 50px;
    height: 50px;
    cursor: pointer;
    color: black;
    float: right;
}

*::selection{
  background: black;
  color: white;
}
#nav h1{
  font-size: 4em;
  font-family: 'Russo one';
  white-space: no-wrap;
}
#nav p {
  margin-top: 70px;
  margin-bottom: 70px;
}
.line {
  width: 30%;
  height: 5px;
  background: white;
  margin: 5px;
  margin-left: 35%;
}
#nav button {
  border: none;
  font-size: 2em;
  width: 50px;
  height: 50px;
  cursor: pointer;
  color: black;
  float: right;
}
h1 {
  text-align: center;
  margin-bottom: 100px;
  font-weight: 900;
}
body {
  background-color: black;
  color: white;
  font-family: sans-serif;
}
h2 {
  font-weight: 700;
  font-size: 2em;
}
span {
  font-size: 1.5rem;
  line-height: 20px;
}

#submit {
  margin-left: 50vw;
  width: 125px;
  height: 40px;
  border: none;
  background: red;
  color: white;
  margin-top: 50px;
  margin-bottom: 20px;
  cursor: pointer;
  font-size: 1rem;
  transition: 250ms;
  font-weight: 700;
}
#submit:hover {
  background: #222;
}
input[type="radio"]:hover {
  cursor: pointer;
  transform: scale(1.5);
}
input[type="radio"] {
  z-index: 1000000;
  margin-left: 70px;
}

@media only screen and (max-width: 600px) {
  #submit {
    margin-left: 40vw;
  }
}
#title {
  padding-top: 15px;
}
span {
  line-height: 25px;
}


h2 {
  margin-top: 20px;
  margin-bottom: 20px;
}

span {
  white-space: pre-line;
}