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

* {
  margin: 0;
  padding: 0;
}

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 230px;
    height: 100vh;
    background-color: #f1f1f1;
    border: 1px solid #555;
  overflow: scroll;
  position: relative;
  top: 53px;
  }

ul span {
  display: block;
  width: 230px;
  padding: 15px 0px;
  background-color: white;
  position: fixed;
  top: 0;
  font-size: 20px;
  font-family: 'Lexend Exa', sans-serif;
  text-align: center;
  font-weight: 800;
}

  li {
    border-top: 1px solid #555;
    box-sizing: border-box;
  }

  li a {
    display: block;
    color: #000;
  padding: 15px 10px;
  text-decoration: none;
    font-family: 'Lexend Exa', sans-serif;
    font-size: 15px;
  }

  li a:hover {
    background-color: #555;
    color: white;
  }

main {
  height: 100vh;
  overflow: scroll;
  margin-left: 25px;
}

main h1 {
  font-family: 'Lexend Exa', sans-serif;
    font-size: 35px;
  margin-bottom: 20px;
  margin-top: 53px;
}
  
main p {
  margin-left: 20px;
  font-family: 'Raleway', sans-serif;
    font-size: 12px;
  font-weight: 400;
  margin-bottom: 10px;
}

body {
    display: flex;
    flex-direction: row; 
}

@media (max-width: 700px) {
  body {
    display: flex;
    flex-direction: column; 
}
  ul {
    width: 100%;
    height: 250px;
    margin-bottom: 30px;
    top: 0;
  }
  ul span {
    position: sticky;
    top: 0;
    padding: 13px 0px;
    background-color: white;
    width: 100%;
  }
}