gutenbergsite/gutenberg/collapsible.css

.lbl-toggle {
  display: block;

  font-weight: bold;
  font-size: 1.2rem;
  text-transform: uppercase;
  text-align:left;

  padding: 1rem;

  color: #A01F13;
  /*background: #FAE042;*/

  cursor: pointer;

  border-radius: 7px;
  transition: all 0.25s ease-out;
}

.lbl-toggle:hover {
  color: #7C5A0B;
}

.lbl-toggle::before {
  content: ' ';
  display: inline-block;

  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 5px solid currentColor;

  vertical-align: middle;
  margin-right: .7rem;
  transform: translateY(-2px);

  transition: transform .2s ease-out;
}

.collapsible-content .content-inner {
  background: #F5ECDB;
  border-bottom: 1px solid rgba(250, 224, 66, .45);

  border-bottom-left-radius: 7px;
  border-bottom-right-radius: 7px;
  padding: .5rem 1rem;
}

.collapsible-content {
  max-height: 0px;
  overflow: hidden;

  transition: max-height .25s ease-in-out;
}

input[type='checkbox'] {
  display: none;
}

.toggle:checked + .lbl-toggle + .collapsible-content {
  max-height: 500px;
}

.toggle:checked + .lbl-toggle::before {
  transform: rotate(90deg) translateX(-3px);
}

.toggle:checked + .lbl-toggle {
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}

.content-inner input[type="text"]{
  width:400px;
}

.content-inner p{
  display:table-row;
}
.content-inner label{
  display:table-cell;

}
.content-inner input{
  display: table-cell;
  margin-bottom: 20px;
}
.content-inner select{
  display: table-cell;
  margin-bottom: 20px;
  width:400px;
}
.search{
  display: table;
}
.search p{
  display: table-row;
}
.search label{
  display: table-cell;
}
.search input{
  display: table-cell;
}

.box {
  /*width: 40%;
  margin: 0 auto;
  background: rgba(255,255,255,0.2);
  padding: 35px;
  border: 2px solid #fff;
  border-radius: 20px/50px;
  background-clip: padding-box;
  text-align: center;*/
}

.button {
  font-size: 1em;
  padding: 10px;
  /*color: #fff;*/
  border: 2px solid #000000;
  border-radius: 20px/50px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease-out;
  display: inline;
  float:right;
}
.button:hover {
  background: #06D85F;
}

.overlay {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.7);
  transition: opacity 500ms;
  visibility: hidden;
  opacity: 0;
}
.overlay:target {
  visibility: visible;
  opacity: 1;
}

.popup {
  margin: 150px auto;
  padding: 20px;
  background: #fff;
  border-radius: 5px;
  width: 30%;
  position: relative;

  transition: all 5s ease-in-out;
}


.popup .close {
  position: absolute;
  top: 20px;
  right: 30px;
  transition: all 200ms;
  font-size: 30px;
  font-weight: bold;
  text-decoration: none;
  color: #333;
}
.popup .close:hover {
  color: #06D85F;
}
.popup .content {
  max-height: 30%;
  overflow: auto;
}

@media screen and (max-width: 700px){
  .box{
    width: 70%;
  }
  .popup{
    width: 70%;
  }
}