flexbox.css

article[contenteditable] {

  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: row;
  -ms-flex-direction: row;
  flex-direction: row;
  -webkit-flex-wrap: wrap;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-align-content: flex-start;
  -ms-flex-line-pack: flex-start;
  align-content: flex-start;
  -webkit-align-items: flex-start;
  -ms-flex-align: start;
  align-items: flex-start;
  max-width: 100%;
}

article > section {
  margin: 0rem;
  -webkit-box-flex: 1;
      -ms-flex: 0 1 100%;
          flex: 0 1 100%;
  -webkit-flex-basis: 100%;



  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
  flex-direction: column;
  -webkit-flex-wrap: nowrap;
  -ms-flex-wrap: nowrap;
  flex-wrap: nowrap;
  -webkit-justify-content: flex-start;
  -ms-flex-pack: start;
  justify-content: flex-start;
  -webkit-align-content: stretch;
  -ms-flex-line-pack: stretch;
  align-content: stretch;
  -webkit-align-items: flex-end;
  -ms-flex-align: end;
  align-items: flex-end;
}
article > section > *:not(.kx){
  -webkit-order: 0;
  -ms-flex-order: 0;
  order: 0;
  -webkit-flex: 0 1 auto;
  -ms-flex: 0 1 auto;
  flex: 0 1 auto;
  -webkit-align-self: auto;
  -ms-flex-item-align: auto;
  align-self: auto;
}

.content style {
  display: none !important;
}

@media (min-width: 800px) {
  section[pattern="two-images"] {
    flex-basis: 50%;
    -webkit-flex-basis: 50%;
    -webkit-align-self: stretch;
    -ms-flex-item-align: stretch;
    align-self: stretch;
  }
  .content section[pattern="two-images"][index="0"] > :not(.toolbar) {
    margin-right: 0;
  }
  .content section[pattern="two-images"][index="1"] > :not(.toolbar){
    margin-left: 0;
  }
}
  

article > section.large {
  flex-basis: 100%;
  flex-grow: 0;
  -webkit-flex-basis: 100%;
  -webkit-flex-grow: 0;
}


article > section.small {
  justify-content: center;
  -webkit-justify-content: center;
}