body { font-family: arial, sans-serif; }

#memo {
  text-align: center;
  display: block;
  margin-top: 150px;
  color: #555478;
}

#slider {
  width: 600px;
  height: 300px;
  overflow: hidden;
  margin-top: 50px;
  margin-left: auto;
  margin-right: auto;
}

#slider .slides {
  display: block;
  width: 3600;
  height: 300px;
  margin: 0;
  padding: 0;
}

#slider .slide {
  float: left;
  list-style-type: none;
  width: 600px;
  height: 300px;
}