styles.css

<style>
img.logo-img {
  background: white;
  border: 10px solid #fff;
  border-radius: 10px;
}

.font120 {
  font-size: 120%;
}

.font75 {
  font-size: 75%;
}

.font70 {
  font-size: 70%;
}

.font45 {
  font-size: 45%;
}

.underline {
  text-decoration: underline;
}

.mt0 {
  margin-top: 0;
}

.mb0 {
  margin-bottom: 0;
}

.white-bg {
  background: white;
  padding: 5px;
}

.bash-strong {
  font-weight: bold;
}

section .fragment.mark,
section .fragment.mark-red {
  opacity: 1;
  visibility: inherit;
}

section .fragment.mark.visible,
section .mark:not(.fragment) {
  background: yellow;
}

section .fragment.mark.visible,
section .fragment.mark.visible .hljs-string,
section .mark:not(.fragment) {
  color: black;
}

section .fragment.mark-red.visible,
section .mark-red:not(.fragment) {
  background: maroon;
}

section .fragment.mark-red.visible,
section .fragment.mark-red.visible .hljs-string,
section .mark-red:not(.fragment) {
  color: white;
}

</style>