Html Css span within div not displays text

Question

My span does not display text on hover and I do not know why. Here is my code:

HTML

body {
  text-align: center;
}

div.box {
  margin: 0 auto;
  border:1px solid red;
  font-size: 0;
  width: 50%;
  --R:150px; /* radius */
  --m:5px;   /* margin */
  --t:50px;  /* distance from top */
}

p {
  font-size: 20px;
}

div.box p {
  width: 50%;
  margin:0;
  padding:0 var(--m);
  display: inline-block;
  vertical-align:top;
  text-align: justify;
}

div.box p:before {
  content: "";
  width: var(--R);
  height: calc(2*var(--R));
  padding:var(--m) 0 var(--m) var(--m);
  margin-top:var(--t);
  background:var(--img);
  background-size:200% 100%;
  shape-outside: circle(var(--R) at var(--d,right) calc(-1*var(--m)) top calc(50% + var(--t)/2));
  float: right;
  border-radius: 500px 0 0 500px;
  margin-right:calc(-1*var(--m));
}

div.box p:last-child:before {
  float: left;
  padding:var(--m) var(--m) var(--m) 0;
  --d:left;
  background-position:right;
  border-radius:0 500px 500px 0;
  margin-left:calc(-1*var(--m));
  margin-right:0;
}

i*,*::before,*::after {
  box-sizing:border-box;
}

.box .tooltiptext {
  visibility: hidden;
  width: 120px;
  background-color: black;
  color: white;
  text-align: center;
  padding: 50px 0;
  /* Position the tooltip */
  position: fixed;
  z-index: 10;
}

.box:hover .tooltiptext {
  visibility: visible;
}

<div class="box" style="--img:url(https://jakuwegiel.web.app/assets/images/DSC_0925a-1.png)">
 <span class="tooltiptext">Tooltip text</span>
 <p>
      Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
  </p>
  <p>
      Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
  </p>
</div> 

Answer 1

Add the following line of code: font-size: 20px;

Over here:

.box .tooltiptext {
    visibility: hidden;
    width: 120px;
    background-color: black;
    color: white;
    text-align: center;
    padding: 50px 0;

    /* Position the tooltip */
    position: fixed;
    z-index: 10;
}