如何为定制范围滑块制作工具提示？

Question

我有一个带有自定义css的范围滑块，用于更改文本的字体。对于我需要工具提示的滑块，此处数字的大小在滑动时也会发生变化，但在工具提示中必须是固定大小。

CSS：

body {

  color: red;
  font-family: "HelveticaNeue", "Helvetica Neue", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: normal;
  margin: 0;
}

header {

  background-color: white;  
  padding: 60px 40px;
}


h1 {
  font-size: 200%;
}

h3 {
  font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: normal;
}

p {
  font-size: 90%;
  font-weight: normal;
}

article {
  -webkit-column-count: 4;
  column-count: 4;
}

p {
  margin: 0px;
}

/**
 * Text Slider Directive - CSS  
 **/


.text-size-slider .slider {
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
  background: none;
  cursor: pointer;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  height: 100%;
  min-height: 50px;
  overflow: hidden;
  width: 240px;
}
.text-size-slider .slider:focus {
  box-shadow: none;
  outline: none;
}
.text-size-slider .slider::-webkit-slider-runnable-track {
  background: red;
  content: '';
  height: 2px;
  pointer-events: none;
}
.text-size-slider .slider::-webkit-slider-thumb {
  height: 18px;
  width: 28px;
  -webkit-appearance: none;
          appearance: none;
  background: #fff;
  border-radius: 8px;
  box-shadow: 5px 0 0 -8px #c7c7c7, 6px 0 0 -8px #c7c7c7, 7px 0 0 -8px #c7c7c7, 8px 0 0 -8px #c7c7c7, 9px 0 0 -8px #c7c7c7, 10px 0 0 -8px #c7c7c7, 11px 0 0 -8px #c7c7c7, 12px 0 0 -8px #c7c7c7, 13px 0 0 -8px #c7c7c7, 14px 0 0 -8px #c7c7c7, 15px 0 0 -8px #c7c7c7, 16px 0 0 -8px #c7c7c7, 17px 0 0 -8px #c7c7c7, 18px 0 0 -8px #c7c7c7, 19px 0 0 -8px #c7c7c7, 20px 0 0 -8px #c7c7c7, 21px 0 0 -8px #c7c7c7, 22px 0 0 -8px #c7c7c7, 23px 0 0 -8px #c7c7c7, 24px 0 0 -8px #c7c7c7, 25px 0 0 -8px #c7c7c7, 26px 0 0 -8px #c7c7c7, 27px 0 0 -8px #c7c7c7, 28px 0 0 -8px #c7c7c7, 29px 0 0 -8px #c7c7c7, 30px 0 0 -8px #c7c7c7, 31px 0 0 -8px #c7c7c7, 32px 0 0 -8px #c7c7c7, 33px 0 0 -8px #c7c7c7, 34px 0 0 -8px #c7c7c7, 35px 0 0 -8px #c7c7c7, 36px 0 0 -8px #c7c7c7, 37px 0 0 -8px #c7c7c7, 38px 0 0 -8px #c7c7c7, 39px 0 0 -8px #c7c7c7, 40px 0 0 -8px #c7c7c7, 41px 0 0 -8px #c7c7c7, 42px 0 0 -8px #c7c7c7, 43px 0 0 -8px #c7c7c7, 44px 0 0 -8px #c7c7c7, 45px 0 0 -8px #c7c7c7, 46px 0 0 -8px #c7c7c7, 47px 0 0 -8px #c7c7c7, 48px 0 0 -8px #c7c7c7, 49px 0 0 -8px #c7c7c7, 50px 0 0 -8px #c7c7c7, 51px 0 0 -8px #c7c7c7, 52px 0 0 -8px #c7c7c7, 53px 0 0 -8px #c7c7c7, 54px 0 0 -8px #c7c7c7, 55px 0 0 -8px #c7c7c7, 56px 0 0 -8px #c7c7c7, 57px 0 0 -8px #c7c7c7, 58px 0 0 -8px #c7c7c7, 59px 0 0 -8px #c7c7c7, 60px 0 0 -8px #c7c7c7, 61px 0 0 -8px #c7c7c7, 62px 0 0 -8px #c7c7c7, 63px 0 0 -8px #c7c7c7, 64px 0 0 -8px #c7c7c7, 65px 0 0 -8px #c7c7c7, 66px 0 0 -8px #c7c7c7, 67px 0 0 -8px #c7c7c7, 68px 0 0 -8px #c7c7c7, 69px 0 0 -8px #c7c7c7, 70px 0 0 -8px #c7c7c7, 71px 0 0 -8px #c7c7c7, 72px 0 0 -8px #c7c7c7, 73px 0 0 -8px #c7c7c7, 74px 0 0 -8px #c7c7c7, 75px 0 0 -8px #c7c7c7, 76px 0 0 -8px #c7c7c7, 77px 0 0 -8px #c7c7c7, 78px 0 0 -8px #c7c7c7, 79px 0 0 -8px #c7c7c7, 80px 0 0 -8px #c7c7c7, 81px 0 0 -8px #c7c7c7, 82px 0 0 -8px #c7c7c7, 83px 0 0 -8px #c7c7c7, 84px 0 0 -8px #c7c7c7, 85px 0 0 -8px #c7c7c7, 86px 0 0 -8px #c7c7c7, 87px 0 0 -8px #c7c7c7, 88px 0 0 -8px #c7c7c7, 89px 0 0 -8px #c7c7c7, 90px 0 0 -8px #c7c7c7, 91px 0 0 -8px #c7c7c7, 92px 0 0 -8px #c7c7c7, 93px 0 0 -8px #c7c7c7, 94px 0 0 -8px #c7c7c7, 95px 0 0 -8px #c7c7c7, 96px 0 0 -8px #c7c7c7, 97px 0 0 -8px #c7c7c7, 98px 0 0 -8px #c7c7c7, 99px 0 0 -8px #c7c7c7, 100px 0 0 -8px #c7c7c7, 101px 0 0 -8px #c7c7c7, 102px 0 0 -8px #c7c7c7, 103px 0 0 -8px #c7c7c7, 104px 0 0 -8px #c7c7c7, 105px 0 0 -8px #c7c7c7, 106px 0 0 -8px #c7c7c7, 107px 0 0 -8px #c7c7c7, 108px 0 0 -8px #c7c7c7, 109px 0 0 -8px #c7c7c7, 110px 0 0 -8px #c7c7c7, 111px 0 0 -8px #c7c7c7, 112px 0 0 -8px #c7c7c7, 113px 0 0 -8px #c7c7c7, 114px 0 0 -8px #c7c7c7, 115px 0 0 -8px #c7c7c7, 116px 0 0 -8px #c7c7c7, 117px 0 0 -8px #c7c7c7, 118px 0 0 -8px #c7c7c7, 119px 0 0 -8px #c7c7c7, 120px 0 0 -8px #c7c7c7, 121px 0 0 -8px #c7c7c7, 122px 0 0 -8px #c7c7c7, 123px 0 0 -8px #c7c7c7, 124px 0 0 -8px #c7c7c7, 125px 0 0 -8px #c7c7c7, 126px 0 0 -8px #c7c7c7, 127px 0 0 -8px #c7c7c7, 128px 0 0 -8px #c7c7c7, 129px 0 0 -8px #c7c7c7, 130px 0 0 -8px #c7c7c7, 131px 0 0 -8px #c7c7c7, 132px 0 0 -8px #c7c7c7, 133px 0 0 -8px #c7c7c7, 134px 0 0 -8px #c7c7c7, 135px 0 0 -8px #c7c7c7, 136px 0 0 -8px #c7c7c7, 137px 0 0 -8px #c7c7c7, 138px 0 0 -8px #c7c7c7, 139px 0 0 -8px #c7c7c7, 140px 0 0 -8px #c7c7c7, 141px 0 0 -8px #c7c7c7, 142px 0 0 -8px #c7c7c7, 143px 0 0 -8px #c7c7c7, 144px 0 0 -8px #c7c7c7, 145px 0 0 -8px #c7c7c7, 146px 0 0 -8px #c7c7c7, 147px 0 0 -8px #c7c7c7, 148px 0 0 -8px #c7c7c7, 149px 0 0 -8px #c7c7c7, 150px 0 0 -8px #c7c7c7, 151px 0 0 -8px #c7c7c7, 152px 0 0 -8px #c7c7c7, 153px 0 0 -8px #c7c7c7, 154px 0 0 -8px #c7c7c7, 155px 0 0 -8px #c7c7c7, 156px 0 0 -8px #c7c7c7, 157px 0 0 -8px #c7c7c7, 158px 0 0 -8px #c7c7c7, 159px 0 0 -8px #c7c7c7, 160px 0 0 -8px #c7c7c7, 161px 0 0 -8px #c7c7c7, 162px 0 0 -8px #c7c7c7, 163px 0 0 -8px #c7c7c7, 164px 0 0 -8px #c7c7c7, 165px 0 0 -8px #c7c7c7, 166px 0 0 -8px #c7c7c7, 167px 0 0 -8px #c7c7c7, 168px 0 0 -8px #c7c7c7, 169px 0 0 -8px #c7c7c7, 170px 0 0 -8px #c7c7c7, 171px 0 0 -8px #c7c7c7, 172px 0 0 -8px #c7c7c7, 173px 0 0 -8px #c7c7c7, 174px 0 0 -8px #c7c7c7, 175px 0 0 -8px #c7c7c7, 176px 0 0 -8px #c7c7c7, 177px 0 0 -8px #c7c7c7, 178px 0 0 -8px #c7c7c7, 179px 0 0 -8px #c7c7c7, 180px 0 0 -8px #c7c7c7, 181px 0 0 -8px #c7c7c7, 182px 0 0 -8px #c7c7c7, 183px 0 0 -8px #c7c7c7, 184px 0 0 -8px #c7c7c7, 185px 0 0 -8px #c7c7c7, 186px 0 0 -8px #c7c7c7, 187px 0 0 -8px #c7c7c7, 188px 0 0 -8px #c7c7c7, 189px 0 0 -8px #c7c7c7, 190px 0 0 -8px #c7c7c7, 191px 0 0 -8px #c7c7c7, 192px 0 0 -8px #c7c7c7, 193px 0 0 -8px #c7c7c7, 194px 0 0 -8px #c7c7c7, 195px 0 0 -8px #c7c7c7, 196px 0 0 -8px #c7c7c7, 197px 0 0 -8px #c7c7c7, 198px 0 0 -8px #c7c7c7, 199px 0 0 -8px #c7c7c7, 200px 0 0 -8px #c7c7c7, 201px 0 0 -8px #c7c7c7, 202px 0 0 -8px #c7c7c7, 203px 0 0 -8px #c7c7c7, 204px 0 0 -8px #c7c7c7, 205px 0 0 -8px #c7c7c7, 206px 0 0 -8px #c7c7c7, 207px 0 0 -8px #c7c7c7, 208px 0 0 -8px #c7c7c7, 209px 0 0 -8px #c7c7c7, 210px 0 0 -8px #c7c7c7, 211px 0 0 -8px #c7c7c7, 212px 0 0 -8px #c7c7c7, 213px 0 0 -8px #c7c7c7, 214px 0 0 -8px #c7c7c7, 215px 0 0 -8px #c7c7c7, 216px 0 0 -8px #c7c7c7, 217px 0 0 -8px #c7c7c7, 218px 0 0 -8px #c7c7c7, 219px 0 0 -8px #c7c7c7, 220px 0 0 -8px #c7c7c7, 221px 0 0 -8px #c7c7c7, 222px 0 0 -8px #c7c7c7, 223px 0 0 -8px #c7c7c7, 224px 0 0 -8px #c7c7c7, 225px 0 0 -8px #c7c7c7, 226px 0 0 -8px #c7c7c7, 227px 0 0 -8px #c7c7c7, 228px 0 0 -8px #c7c7c7, 229px 0 0 -8px #c7c7c7, 230px 0 0 -8px #c7c7c7, 231px 0 0 -8px #c7c7c7, 232px 0 0 -8px #c7c7c7, 233px 0 0 -8px #c7c7c7, 234px 0 0 -8px #c7c7c7, 235px 0 0 -8px #c7c7c7, 236px 0 0 -8px #c7c7c7, 237px 0 0 -8px #c7c7c7, 238px 0 0 -8px #c7c7c7, 239px 0 0 -8px #c7c7c7, 240px 0 0 -8px #c7c7c7;
  margin-top: -8px;
  border: 1px solid #777;
}
.text-size-slider .slider::-moz-range-track {
  width: 240px;
  height: 2px;
}
.text-size-slider .slider::-moz-range-thumb {
  height: 18px;
  width: 28px;
  background: #fff;
  border-radius: 8px;
  border: 1px solid #777;
  position: relative;
}
.text-size-slider .slider::-moz-range-progress {
  height: 2px;
  background: #e33d44;
  border: 0;
  margin-top: 0;
}
.text-size-slider .slider::-ms-track {
  background: transparent;
  border: 0;
  border-color: transparent;
  border-radius: 0;
  border-width: 0;
  color: transparent;
  height: 2px;
  margin-top: 10px;
  width: 240px;
}
.pointer {
  height: 40px;
  width: 40px;
  border-radius:20px 20px  0 20px;
  background-color:#FFF;
  display:block;
  transform: rotate(45deg);
  position:absolute;
  top: 0px;
  margin-left:8px;
  color:black;

}

.pointer span {
  display: inline-block;
  transform: rotate(-45deg);
  margin-left:12px;
  margin-top: 14px;


}
.text-size-slider .slider::-ms-thumb {
  height: 18px;
  width: 28px;
  background: #fff;
  border-radius: 8px;
  border: 1px solid #777;
}
.text-size-slider .slider::-ms-fill-lower {
  background: #e33d44;
  border-radius: 0;
}
.text-size-slider .slider::-ms-fill-upper {
  background: #c7c7c7;
  border-radius: 0;
}

这是我的傻瓜：

https://plnkr.co/edit/gctpR9dcmQkZ82iDTC2e?p=preview

我需要获取工具提示，如下图所示：

先谢谢。