#header_line {
  background-color: black;
  width: 100%;
  height: 6px;
  box-shadow: 0px 6px 10px black;
}

@media only screen and (min-width : 790px) {
  header {
    font-size: 48px;
    padding-top: 90px;
    text-shadow: 0px 6px 24px black;
  }

  #header_line {
    margin-top: 60px;
  }

  .descriptio-box {
    margin-top: 10px;
    margin-left: 15%;
    margin-right: 15%;
    border: 2px solid black;
    border-radius: 10px;
    padding: 10px;
    background-color: #272727;
  }
}

@media only screen and (max-width : 789px) {
  header {
    font-size: 30px;
    padding: 20px;
    margin-top: 35px;
    text-shadow: 0px 6px 24px black;
  }

  #header_line {
    margin-top: 10px;
  }

  .descriptio-box {
    font-size: 12px;
    margin-top: 5px;
    margin-left: 5%;
    margin-right: 5%;
    border: 1px solid black;
    border-radius: 6px;
    padding: 6px;
    background-color: #272727;
  }
}