pro-vue/lib/src/countdown/style/index.css

.pro-count {
  display: inline-block;
  line-height: 1;
  white-space: nowrap;
  background: #fff;
  border: 1px solid #dcdfe6;
  color: #606266;
  -webkit-appearance: none;
  -moz-appearance: none;
       appearance: none;
  text-align: center;
  box-sizing: border-box;
  outline: none;
  margin: 0;
  transition: 0.1s;
  font-weight: 500;
  padding: 12px 20px;
  font-size: 14px;
  border-radius: 4px;
}