.memory-set {
  margin: 0 0 1.5rem;
}

.memory-set h3 {
  background: var(--color-black);
  padding: .25rem .5rem;
  font-weight: 300;
  color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-lighter);
}

.memory-set__content {
  background: hsla(0,0%,100%,.25);
}

.memory-set__icons {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
}

.memory-set__icon-link {
  position: relative;
}

.memory-set__icon-link:hover,
.memory-set__icon-link:active,
.memory-set__icon-link:focus {
  text-decoration: none;
  background: hsla(0,0%,100%,.25);
}

.memory-set__icon-num {
  position: absolute;
  top: .25rem;
  left: .25rem;
  display: block;
  width: 1rem;
  text-align: center;
  line-height: 1.5;
  background: var(--color-gray);
  color: var(--color-white);
}

.memory-set__set-effect,
.memory-set__resonance {
  padding: .75rem;
}

.memory-set__set-effect h4,
.memory-set__resonance h4 {
    font-weight: 400;
}

.memory-set__set-effect p,
.memory-set__resonance p {
  margin: 0;
}

.memory-set__nav {
  display: flex;
  justify-content: flex-end;
  border-top: 1px solid var(--color-gray-lighter);
}

.memory-set__nav-btn {
  border: none;
  padding: .5rem;
  cursor: pointer;
  margin-left: 1px;
  background: var(--color-white-lighter);
  color: var(--color-black);
}

.memory-set__nav-btn[disabled] {
  background: var(--color-white-darker);  
  color: var(--color-gray-lighter);
}

@media (min-width: 640px) { 
  .memory-set h3 {
    text-align: right;
  }
}