.content-element {
  position: relative;
  border: 2px dashed transparent;
  margin: 3rem;
  max-height: 300px;
  max-width: 400px;
}
.content-element:hover {
  border: 2px dashed black;
}
.react::before {
  content: url("data:image/svg+xml;charset=UTF-8,<svg xmlns='http://www.w3.org/2000/svg' height='48' viewBox='0 -960 960 960' width='48'><path d='M594-417H189q-26 0-44.5-18.5T126-480q0-26 18.5-44.5T189-543h405l-77-77q-18-18-18-44t18-44q18-18 44-18t44 18l184 183q9 9 14 21t5 24q0 12-5 24t-14 21L605-252q-18 18-44 18t-44-18q-18-18-18-44t18-44l77-77Z'/></svg>");
}
.add::before {
  content: url("data:image/svg+xml;charset=UTF-8,<svg height='48' viewBox='0 -960 960 960' width='48' xmlns='http://www.w3.org/2000/svg'><path d='M417-417H229q-26 0-44.5-18.5T166-480q0-26 18.5-44.5T229-543h188v-188q0-26 18.5-44.5T480-794q26 0 44.5 18.5T543-731v188h188q26 0 44.5 18.5T794-480q0 26-18.5 44.5T731-417H543v188q0 26-18.5 44.5T480-166q-26 0-44.5-18.5T417-229v-188Z'/></svg>");
}
.react::before,
.add::before {
  height: 100%;
  width: 4rem;
  position: absolute;
  left: -4rem;
  top: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.content-element:hover .hover-only {
  opacity: 1;
}
.hover-only {
  opacity: 0;
  transition: opacity 0.2s ease-in-out;
}
.content-element-menu-container-top {
  position: absolute;
  top: -2.5rem;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: center;
}
.content-element-menu-container-bottom {
  opacity: 0;
  position: absolute;
  bottom: -2.5rem;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: center;
}
.molecule-name {
  font-family: sans-serif;
  font-weight: bold;
  font-size: 1.5rem;
}
input {
  border: none;
  border-bottom: 1px solid black;
}
.content-element-menu-container-side {
  height: 100%;
  width: 2rem;
  position: absolute;
  top: 0;
  right: -2.5rem;
}
.content-element-menu-container-side > div {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  justify-content: center;
  align-items: center;
}
.content-element-menu-side-hover {
  opacity: 0;
}
.content-element-menu-container-side:hover .content-element-menu-side-default {
  opacity: 0;
}
.content-element-menu-container-side:hover .content-element-menu-side-hover {
  opacity: 1;
}
canvas:not(:first-child) {
  position: absolute;
  top: 0;
  left: 0;
}