.slide-content {
    width: 300px;
    height: 135px;
    background-color: lightgray;
    border-radius: 5px;
    overflow: hidden;
    position: relative;
}
.slid-er {
  height: 100%; /* slide-content height + 2*margin */
  margin: auto;
  overflow: hidden;
  width: 100%;
}
.slid-er .slides {
  display: flex;
}
.slid-er .slide {
  width: 100%; /* slide-content width + margin */
}
.button-container {
  position: absolute;
  top: 0;
  height: 100%;
  width: 100%;
  opacity: 0;
  background-color: rgba(0, 0, 0, 0.4);
  cursor: pointer;
  transition: opacity 0.25s;
}
.button-container:hover {
  opacity: 1;
}
.button-container:hover .button {
  transform: translate(-50%, -50%);
}
.button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, calc(-50% + 12px));
  background-color: rgba(0, 0, 0, 0.7);
  transition: all 0.25s;
  padding: 0 8px;
  border-radius: 12px;
  color: white;
  outline: 2px solid transparent;
}
.button:after {
  content: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAQElEQVR42qXKwQkAIAxDUUdxtO6/RBQkQZvSi8I/pL4BoGw/XPkh4XigPmsUgh0626AjRsgxHTkUThsG2T/sIlzdTsp52kSS1wAAAABJRU5ErkJggg==);
  margin: 0 3px 0 5px;
  filter: invert(1);
}
.button:hover {
  background-color: rgba(0, 0, 0, 0.9);
  box-shadow: 0 0 0 2px gray;
}