table{
  margin-top:15px;
  border-collapse:collapse;
  border:1px solid #aaa;
  width:100%;
}
table th {
  vertical-align:baseline;
  padding:5px 15px 5px 6px;
  background-color:#3F3F3F;
  border:1px solid #3F3F3F;
  text-align:left;
  color:#fff;
}
table td {
  vertical-align:text-top;
  padding:6px 15px 6px 6px;
  border:1px solid #aaa;
}
table tr:nth-child(odd) {
  background-color:#F5F5F5;
}
table tr:nth-child(even) {
  background-color:#fff;
}

.class_tab{

}