table{
  width:70%;
  height:60%;
  margin: auto;
  vertical-align: middle;
  text-align: center;
}
.td{
  color: white;
}
.tools{
}
p{
  color: black;
}
a{
  color: black;
  text-align: center;/*字体居中*/
  text-decoration: none;/*去掉下划线*/
}