* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-size: 100%;
  font-weight: normal;
  font-style: normal;
}

body {
  font-family: "Noto Serif KR", "Times New Roman", Times, serif;
  font-size: 18px;
  letter-spacing: -.18px;
  line-height: 1.7;
  word-break: keep-all;
  color: black;
  background-color: GhostWhite;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 18px;
}

h1 {
  margin-top: 36px;
  margin-bottom: 36px;
  text-align: center;
  font-size: 36px;
  background-color: GhostWhite;
}

p {
  margin-bottom: 18px;
  text-align: justify;
  word-break: break-all;
  font-size: 20px;
  }


strong {
  position: sticky;
  position: -webkit-sticky;
  z-index: 1;
  top: 36px;
  text-decoration: none;

}


a {
  text-decoration: underline;
  color: black;
}

a:hover {
  color:yellow;
}


hr {
  width: 100%;
  margin: 36px 0;
  margin-top: 36px;
  margin-bottom: 36px;
  border: 0;
  height: 1px;
  background-color: black;
}


.photo {
  width: 100%;
  display: block;

  /*padding: 10vw;*/
}

@media screen and (min-width: 600px) {
  .photo {
    width: 60%;
    float: left;
  }
}

img {
  max-width: 100%;
  height: auto;
  margin-bottom: 1vw;
}

figure {
  position: relative;
  margin: 0;
  line-height: 0;
  margin-right: 2vw;
  margin-bottom: 2vw;
}

figcaption {
position: relative;
text-align: left;
font-size: 0.5vw;
/* margin: 1vw;
 margin-bottom: 2vw;
*/
}


/* html에 이것 쓰기
  <figure class="iframebox">
    <iframe frameborder="0" scrolling="no" style="border:0px" src="https://books.google.co.kr/books?id=H7MWAAAAQAAJ&lpg=PA305&ots=6Ku7NNS4AS&dq=Exposition%20du%20system%20du%20monde%20corps%20obscurs&hl=ko&pg=PA305&output=embed" width=500 height=500></iframe>
</figure>
*/

/*
.iframebox {
  z-index: 8;
 width: 100%;
 padding-bottom: 56.25%;
 float: left;
 }

 .iframebox iframe {
 position: absolute;
 width: 100%;
 height: 100%;
padding-bottom: 2vw;
 }​

@media screen and (min-width: 600px) {
.iframebox {
 position: relative;
 width: 100%;
 height: 100%;
 padding-bottom: 56.25%;
 float: left;
 }
}

@media screen and (min-width: 600px) {
.iframebox iframe {
 position: relative;
 width: 100%;
 height: 100%;
 padding-right: 2vw;
 
 }​
}
*/

.letter{
  width: 100%;

  display: block;

}

@media screen and (min-width: 600px) {
  .letter {
    width: 40%;
    float: right;
  }
}

.memo{
  position: sticky;
  position: -webkit-sticky;
  font-size: 3vw;
  padding: 6vw;
  color: black;
}

@media screen and (min-width: 600px) {
  .memo {
   font-size: 1vw;
   padding: 1.5vw;
  }
}

.memo.memo1 {
  z-index: 7;
  background-image: linear-gradient(yellow,  tomato);
  height: 160vw;
  top: 5px;
  left: 30px;
  font-size: 16px;
 
}

@media screen and (min-width: 600px) {
  .memo.memo1 {
    height: 60vw;
    font-size: 16px;
  }
}


.memo.memo10{
  z-index: 8;
  background-color: DeepPink;
  height: 100vw;
  font-size: 6vw;
 
}
sub{
    font-size: 1vw;

  }

@media screen and (min-width: 600px) {
  .memo.memo10 {
    height: 40vw;
    font-size: 2.2vw;

  }
  sub{
    font-size: 0.6vw;

  }
}

.memo.memo2{
  z-index: 9;
  background-color: lightgray;
  height: 130vw;
  top: 10px;
  left: 30vw;
  font-size: 5vw;
}

@media screen and (min-width: 600px) {
  .memo.memo2 {
    height: 60vw;
    font-size: 1.5vw;
  }
}


.memo.memo3{
  z-index: 10;
  background-color: tomato;
  height: 120vw;
  top: 10px;
  left: 30vw;
  font-size: 3vw;
}
 sub{
    font-size: 1.5vw;
  }

@media screen and (min-width: 600px) {
  .memo.memo3 {
    height: 60vw;
     font-size: 1.2vw;
  }
  sub{
    font-size: 0.6vw;

  }
}



.memo.memo4{
  z-index: 11;
  height: 130vw;
  top: 10px;
  left: 30vw;
  font-size: 4vw;
  background-image: linear-gradient(gray, black);
}

@media screen and (min-width: 600px) {
  .memo.memo4 {
    height: 50vw;
    font-size: 1.5vw;
  }
}

.memo.memo5{
  z-index: 12;
  height: 110vw;
  top: 10px;
  left: 30vw;
  font-size: 32px;
  background-color: Crimson;
}

@media screen and (min-width: 600px) {
  .memo.memo5 {
    height: 40vw;
    font-size: 36px;
  }
}

.memo.memo6{
  z-index: 13;
  height: 130vw;
  top: 10px;
  left: 30vw;
  font-size: 4vw;
  background-image: linear-gradient(DarkTurquoise, PaleGreen);
}

@media screen and (min-width: 600px) {
  .memo.memo6 {
    height: 50vw;
    font-size: 1.5vw;
  }
}


.memo.memo7{
  z-index: 14;
  background-color: Gold;
  height: 160vw;
  top: 10px;
  left: 30vw;
  font-size: 3.5vw;
}
 sub{
    font-size: 1.5vw;
  }

@media screen and (min-width: 600px) {
  .memo.memo7 {
    height: 55vw;
     font-size: 1.2vw;
  }
  sub{
    font-size: 0.6vw;

  }
}

.memo.memo8{
  z-index: 15;
  background-color: LightBlue;
  height: 140vw;
  top: 10px;
  left: 30vw;
  font-size: 5vw;
}

@media screen and (min-width: 600px) {
  .memo.memo8 {
    height: 50vw;
    font-size: 20px;
  }
}


.memo.memo11{
  z-index: 16;
  background-color: Lime;
  height: 160vw;
  top: 10px;
  left: 30vw;
  font-size: 5vw;
 
}
sub{
    font-size: 1vw;

  }

@media screen and (min-width: 600px) {
  .memo.memo11 {
    height: 55vw;
    font-size: 2.2vw;

  }
  sub{
    font-size: 0.5vw;

  }
}

.memo.memo9{
  z-index: 17;
  background-color: black;
  color: white;
  height: 180vw;
  top: 10px;
  left: 30vw;
  font-size: 4vw;
}

@media screen and (min-width: 600px) {
  .memo.memo9 {
    height: 80vw;
    font-size: 1.5vw;
  }
}

.뒤로 {
  z-index: 99;
  text-decoration: none;
  position: fixed;
  right: 80px;
  bottom: 80px;
  font-size: 40px;
  animation: back 10s infinite alternate;
}