main.css

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

body {
  font-family: Sarabun, Arial, sans-serif;
  font-size: 14px;
  height: 100%;
}

th {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 2;
}
  
p {
  margin: 10px 0;
}

textarea {
  resize: none;
}

button {
  font-size: 16px;
  margin-top: 10px;
}

#query-editor, #query-result {
  width: 49%;
  height: 150px;
}

#query-copy {
  margin-left: 7px;
}

#result-copy {
  position: absolute;
  left: 49.5%;
}

#btt {
  position: fixed;
  bottom: 20px;
  right: 20px;
  font-size: 18px;
  font-weight: bold;
  opacity: .6;
  animation-name: bttOut;
  animation-duration: .7s;
}
  @keyframes bttOut {
    from { opacity: 1; }
    to { opacity: .6; }
  }
  @keyframes bttHover {
    from { opacity: .6; }
    to { opacity: 1; }
  }
  #btt:hover {
    opacity: 1;
    animation-name: bttHover;
    animation-duration: .7s;
  }

#data-section {
  margin-top: 20px;
  padding-bottom: 65px;
}
  
#data-table {
  width: 100%;
}
  #data-table th {
    background: #444;
    color: #ddd;
    font-size: 14px;
  }
  #data-table tbody tr:nth-child(even) {
    background: #eee;
  }
  #data-table td {
    padding: 10px 8px;
    font-size: 13px;
    text-align: left;
    vertical-align: top;
  }
  #data-table p {
    margin: 0;
    line-height: 1.8em;
    text-indent: 3em;
  }
  #data-table p+p {
    margin-top: 8px;
  }  
  #data-table ul {
    margin: 0 0 0 1em;
    padding: 0;
  }
  #data-table li+li {
    margin-top: 10px;
    padding: 0;
  }