JSFiddle - React, Tailwind, and code Playground

HTML

<div class="panel panel-default1">
            <div class="panel-body">
              <div class='amg-corner-button_wrap'></div>

              <div class="overlay-content">
                <h2>Image Ink Logo</h2>
                <p>Logo for a screen printing company. They wanted a detachable/recognizable brand that didn't need the name of the company.</p>
              </div>

            </div> <!-- panel body -->

          </div> <!-- panel default -->

CSS

.panel-default1 {
  padding-top: 10px;
  border-radius: 20px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.10);
  height: 400px;
  width: 400px;
  overflow: hidden;
  margin: 0 auto;
  position: relative;
}

.amg-corner-button_wrap {
  display: block;
  background-color: #e8c63d;
  position: absolute;
  transform: rotate(45deg);
  right: -320px;
  bottom: -320px;
  width: 400px;
  height: 400px;
  -moz-transition: all 0.5s ease-out;
  -o-transition: all 0.5s ease-out;
  -webkit-transition: all 0.5s ease-out;
  transition: all 0.5s ease-out;
}

.amg-corner-button_wrap:hover {
  transform: rotate(45deg) scale(4);
}

.overlay-content {
  pointer-events: none;
  bottom: 0;
  color: #333;
  left: 0;
  opacity: 0;
  padding: 30px;
  position: absolute;
  height: 100%;
  width: 100%;
  box-sizing: border-box;
  padding: 8px;
  right: 0;
  top: 0;
  -moz-transition: all 0.3s ease-out;
  -o-transition: all 0.3s ease-out;
  -webkit-transition: all 0.3s ease-out;
  transition: all 0.3s ease-out;
}

.overlay-content h2 {
  border-bottom: 1px solid #333;
  padding: 0 0 12px;
}

.amg-corner-button_wrap:hover ~ .overlay-content {
  opacity: 1;
  -moz-transition: all 0.3s ease-out;
  -o-transition: all 0.3s ease-out;
  -webkit-transition: all 0.3s ease-out;
  transition: all 0.3s ease-out;
  -moz-transition-delay: 0.3s;
  -o-transition-delay: 0.3s;
  -webkit-transition-delay: 0.3s;
  transition-delay: 0.3s;
}