pres-style.css

.reveal h1,
.reveal h2,
.reveal h3,
.reveal h4,
.reveal h5,
.reveal h6 {
  text-transform: none;
}

.reveal h5 {
  font-size: 0.80em;
}

.reveal h6 {
  font-size: 0.60em;
}

.reveal p {
  font-size: 80%;
  text-align: left;
}

.reveal figcaption {
  font-size: 60%;
}

.reveal p.pbcenter {
  text-align: center;
}

.reveal ul, .reveal ol {
  font-size: 80%;
}

.reveal blockquote {
  text-align: left;
  font-size: 80%;
  width: 80%;
}

.reveal code {
  font-size: 60%;
  line-height: 1.3; 
}

.reveal code.codeinline {
  font-size: 100%;
  line-height: 1.0;
}

.reveal ul.pbsmaller, .reveal table.pbsmaller, .reveal p.pbsmaller, div.pbsmaller {
    font-size: 70%; }

.reveal p.pbcentersmaller2 {
  text-align: center;
  font-size: 50%;
}
  
.reveal div.pbverysmall {
  font-size: 33%; 
}

.reveal img.pbfloor {
    margin-bottom: -10px;
    margin-top: 0px;
}
  
.reveal section img {
  box-shadow: 0 0 0px rgba(0, 0, 0, 0.15);
  border: 0; }

.row {
  display: flex;
}
  
.column {
  flex: 50%;
}

.pbcolumns { 
  display: flex; width: 100%; 
}

.pbcolumns div { 
  flex-grow: 1; 
}

.pbcolumns div {
  padding: 8px;
}