body {
    padding-left: 15%;
    padding-right: 15%;
    font-size: 120%;
    font-family: sans-serif;
    line-height: 30px;
}

p {
    margin-left: 20px;
}

.chapter2-advice {
    border: 2px solid black;
    border-radius: 7px;
}

.tabcontent {
    color: black;
    display: none;
    padding: 100px 20px;
    height: 100%;
}

.tablink:hover {
    background-color: #777;
}

.tablink {
    background-color: #555;
    color: white;
    float: left;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 14px 16px;
    font-size: 17px;
    width: 33%;
  }

  h1{
    line-height: 40px;
  }