.sns {
  width: 8%;
  max-width: 90px;
  position: fixed;
  top: 15%;
  right: 0;
  z-index: 10;
}

.sns__list li:not(:last-child) {
  margin-bottom: 4px;
}

.sns__list li a {
  display: block;
  transition: all 0.3s;
}

.sns__list li a:hover {
  opacity: 0.8;
}

@media screen and (max-width: 768px) {
  .sns {
    width: 100%;
    max-width: 100%;
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 10;
  }

  .sns__list li:not(:last-child) {
    margin-bottom: 0;
  }

  .sns__list {
    display: flex;
  }

  .sns__list li {
    display: inline-block;
    width: 50%;
    margin-bottom: 0;
  }
}