[Solved] Why cannot I format the font color as white


You have style overriding yours so you can be more specific like this :

a.accordionTitle,
a.accordion__Heading {
  background-color: #00008B;
  text-align: center;
  font-weight: 700;
  padding: 2em;
  display: block;
  text-decoration: none;
  color:white;
  -webkit-transition: background-color 0.5s ease-in-out;
  transition: background-color 0.5s ease-in-out;
  border-bottom: 1px solid #8000000;
}

Or use important like this :

.accordionTitle,
.accordion__Heading {
  background-color: #00008B;
  text-align: center;
  font-weight: 700;
  padding: 2em;
  display: block;
  text-decoration: none;
  color:white!important;
  -webkit-transition: background-color 0.5s ease-in-out;
  transition: background-color 0.5s ease-in-out;
  border-bottom: 1px solid #8000000;
}

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solved Why cannot I format the font color as white