body {
  font-family: sans-serif;
}

header {
  background-color: #f0f0f0;
  padding: 1px;
}

.page-viewer {
  display: flex;
  flex-direction: column;
  height: 100vh;

}

.page-strip {
  display: flex;
  overflow-x: auto;
  white-space: nowrap;
  padding: 10px;
}

.page-strip img {
  width:150px;
  height: 150px;
  margin: 20px;
  cursor: pointer;
  border-radius: 10%;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.9);
}

.page-frame {
  flex: 1; /* Занимает все свободное пространство */
  border: none;
  width:90%;
  margin: 0 10% 0  5% ;
  border-radius: 3%;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.9);
}
.button {
	width: 200px;
	margin-top: 10px;
	margin-right: auto;
	margin-bottom: auto;
	margin-left: auto;
	padding-top: 10px;
	padding-right: 10px;
	padding-bottom: 10px;
	padding-left: 10px;
	text-align: center;
	vertical-align: middle;
	border-radius: 0px;
	text-transform: uppercase;
	font-weight: bold;
	letter-spacing: 2px;
	border: 3px solid #FFFFFF;
	color: #FFFFFF;
	transition: all 0.3s linear; 
}