.scroll_top {
  width: 50px;
  height: 50px;
  position: fixed;
  right: 0;
  bottom: 50px;
  background: url(../images/scroll_top.png) left center no-repeat;
  cursor: pointer;
  display: none;
}
.mytable {
  max-width: 50%;
  margin: 0 auto;
  text-align: center;
  font-size: 14px;
  border: 1px solid #ccc;
  font-family: Arial, Helvetica, sans-serif;
  width: 100%;
  border-collapse: collapse;
}

.mytable td {
  padding: 4px;
  margin: 3px;
  border: 1px solid #ccc;
}

.mytable th {
  background-color: #104e8b;
  color: #fff;
  font-weight: bold;
}
tbody tr:nth-child(1) th {
  font-size: 18px;
  padding: 10px;
}