body {
  margin: 0;
  padding: 0;
}
.logo {
  margin-top: 5vh;
  height: 15vh;
  position: relative;
}
.logo img {
  margin: 0;
  width: 30vw;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.content {
  height: 80vh;
  position: relative;
}
.content img {
  margin: 0;
  width: 45vw;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  height: 80px;
  line-height: 80px;
  text-align: center;
  font-size: 14px;
}
.footer a {
  color: #000;
  font-size: 14px;
}