Please review the new question and ignore the following.

Please review the new question and ignore the following.

Note

Please review the new question and ignore the following.

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
}

header,
footer:not([hidden]) {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
  padding: 5px;
}

header {
  background: linear-gradient(#FFF, #CCC);
}

footer {
  background: linear-gradient(#CCC, #FFF);
}

main {
  flex: 1;
  display: flex;
}

main.horizontal {
  flex-direction: column;
}

header *,
footer * {
  font: 0.75rem Arial;
  color: #333;
}

select,
button,
input {
  margin: 0;
}

label[for="textareaSize"],
address {
  margin-left: auto;
}

#textareaSize,
iframe {
  padding: 0;
}

output {
  font-family: monospace;
}

.toggle {
  border: 1px solid #666;
  border-radius: 12px;
  padding: 2px 6px;
  background: transparent;
}

#footerToggle {
  width: 16px;
  height: 16px;
  border-bottom-width: 5px;
  border-radius: 0;
  padding: 0;
}

.active {
  border-color: #333;
  background: #FFF;
}

#copy {
  border: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
}

img {
  display: block;
}

div {
  flex: 0px;
  position: relative;
}

#iframeWrap {
  border-left: 5px solid #CCC;
}

main.horizontal #iframeWrap {
  border-left: 0;
  border-top: 5px solid #CCC;
}

div * {
  position: absolute;
  width: 100%;
  height: 100%;
  margin: 0;
  border: 0;
  background: #FFF;
}

textarea {
  box-sizing: border-box;
  padding: 5px;
  outline: 0;
  resize: none;
  color: #333;
}

textarea.dark {
  background: #333;
  color: #FFF;
}

html,
body {
  height: 100%;
  padding: 0;
  margin: 0;
}

body {
  display: flex;
  flex-direction: column;
}

header,
footer:not([hidden]) {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
  padding: 5px;
}

header {
  background: linear-gradient(#FFF, #CCC);
}

footer {
  background: linear-gradient(#CCC, #FFF);
}

main {
  display: flex;
  flex: 1;
}

main.horizontal {
  flex-direction: column;
}

header *,
footer * {
  font: 0.75rem Arial;
  color: #333;
}

select,
button,
input {
  margin: 0;
}

label[for="textareaSize"],
address {
  margin-left: auto;
}

#textareaSize,
iframe {
  padding: 0;
}

output {
  font-family: monospace;
}

.toggle {
  padding: 2px 6px;
  border: 1px solid #666;
  border-radius: 12px;
  background: transparent;
}

#footerToggle {
  width: 16px;
  height: 16px;
  padding: 0;
  border-bottom-width: 5px;
  border-radius: 0;
}

.active {
  border-color: #333;
  background: #FFF;
}

#copy {
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

img {
  display: block;
}

div {
  position: relative;
}

#iframeWrap {
  border-left: 5px solid #CCC;
}

main.horizontal #iframeWrap {
  border-left: 0;
  border-top: 5px solid #CCC;
}

div * {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 0;
  margin: 0;
  background: #FFF;
}

textarea {
  box-sizing: border-box;
  padding: 5px;
  outline: 0;
  resize: none;
  color: #333;
}

textarea.dark {
  background: #333;
  color: #FFF;
}