body {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

.main {
  width: 1200px;
  margin: 0 auto;
}
.line3hidden{
  overflow:hidden;

  text-overflow:ellipsis;

  display:-webkit-box;

  -webkit-box-orient:vertical;

  -webkit-line-clamp:3;
}
.input::-webkit-input-placeholder {
  color: #0ff;
  font-size: 18px;
}

.input:-moz-placeholder {
  color: #0ff;
  font-size: 18px;
}

.input:-ms-input-placeholder {
  color: #0ff;
  font-size: 18px;

}