/* ---------------------------------------------------
index
---------------------------------------------------- */
body {
  background: #000;
  color: #fff;
}

.mainWrap {
  position: relative;
  height: 100vh;
}
.mainWrap > figure {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  text-align: center;
}
.mainWrap > figure > img {
  width: 80%;
  max-width: 280px;
}
.mainWrap > figure > figcaption {
  display: block;
  font-family: Arial, Helvetica, "sans-serif";
  margin-top: 20px;
}

/* SP ---------------------------------------------- */
@media only screen and (max-width: 768px) {
  .mainWrap > figure > img {
    width: 100%;
    max-width: 100%;
  }
}