.content {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  overflow: auto;
  background-color: #111;
  -webkit-transition-property: top, bottom;
          transition-property: top, bottom;
  -webkit-transition-duration: .2s, .2s;
          transition-duration: .2s, .2s;
  -webkit-transition-timing-function: linear, linear;
          transition-timing-function: linear, linear;
  -webkit-overflow-scrolling: touch;
}

.action-bar + .tab-fixed + .content {
  top: 96px;
}

.tab-fixed + .content,
.action-bar ~ .content {
  top: 48px;
}

.inset {
  padding: 10px;
}

.scroll {
  overflow: auto;
}
.content {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  overflow: auto;
  background-color: #111;
  -webkit-transition-property: top, bottom;
          transition-property: top, bottom;
  -webkit-transition-duration: .2s, .2s;
          transition-duration: .2s, .2s;
  -webkit-transition-timing-function: linear, linear;
          transition-timing-function: linear, linear;
  -webkit-overflow-scrolling: touch;
}

.action-bar + .tab-fixed + .content {
  top: 96px;
}

.tab-fixed + .content,
.action-bar ~ .content {
  top: 48px;
}

.inset {
  padding: 20px;
}

.scroll {
  overflow: auto;
}
Change .inset padding to 20px
Change .inset padding to 20px
