datepicker/src/components/index/picker.css

.container {
  min-width: 170px;
  cursor: text;
  position: relative;
  font-size: 14px;
  overflow: hidden;
}
.input {
  font-family: "Chinese Quote", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  width: 100%;
  height: 32px;
  margin: 0;
  padding: 4px 11px;
  outline: none;
  line-height: 1.5;
  box-sizing: border-box;
  font-size: 14px;
  color: rgba(0, 0, 0, 0.65);
  border: none;
  border-bottom: 1px solid #ccc;
}
.line {
  width: 100%;
  position: absolute;
  bottom: 0;
  left: 0;
  border-bottom: 1px solid #1890ff;
  transform: translateX(-100%);
  transition: transform .15s cubic-bezier(0.17, 1.05, 0.9,-0.15);
}
.input-focus {
  transform: translateX(0);
}
.calendar {
  position: absolute;
  margin-top: 8px;
  right: 11px;
  display: inline-block;
  width: 16px;
  height: 16px;
  background-image: url('../../static/icon-calendar.svg');
  background-position: center; 
  background-size: 16px 16px;
}