*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Уровень 1 */
.block-menu {
  position: relative;
  background: #818181;
  width: 30px;
  height: 100vh;
  display: inline-block;
  transition: width 1s;
}

h1 {
  color: #ffffff;
  transform: rotate(90deg);
  white-space: nowrap;
  position: absolute;
  top: 300px;
  left: -34px;
  font-weight: bold;
  transition: transform 1s, visibility 0.7s, color 1s;
}

.block-menu:hover {
  width: 300px;
}

.block-menu:hover h1 {
  transform: translateX(270px) rotate(90deg);
  color: #9e9e9e;
  visibility: hidden;
}

.menu {
  line-height: 2.5;
  position: absolute;
  top: 100px;
  left: -150px;
  visibility: hidden;
  transition: transform 1s, visibility 0.3s;
}

li::before {
  content: "";
  display: inline-block;
  border: 3px black solid;
  background: orange;
  width: 12px;
  height: 12px;
  transform: rotate(45deg);
}

a {
  padding-left: 15px;
  text-decoration: none;
  color: #ffffff;
  font-weight: bold;
  font-size: 20px;
}

.block-menu:hover .menu {
  visibility: visible;
  opacity: 1;
  transform: translateX(200px);
}

a:hover {
  color: rgb(255, 208, 0);
  transition: color 0.3s linear;
}

/* Уровень 2  */
.header {
  background: #0d5825;
  width: 600px;
  height: 625px;
  font-size: 25px;
  color: white;
  text-align: center;
  padding-top: 40px;
  position: relative;
  float: right;
  margin-right: 449px;
}

blockquote::before {
  content: "\201C";
}

blockquote::after {
  content: "\201D	";
}

blockquote {
  font-weight: bold;
}

p {
  line-height: 1.3;
  font-style: italic;
}

img {
  width: 150px;
  position: absolute;
  left: 150px;
}

.card1 {
  top: 250px;
  transform: rotate(-30deg);
  transition: transform 0.5s;
}

.card2 {
  left: 210px;
  top: 250px;
  transform: rotate(-15deg);
  transition: transform 0.5s;
}

.card3 {
  left: 267px;
  top: 270px;
  transform: rotate(5deg);
  transition: transform 0.5s;
}

.card1:hover {
  transform: translateY(-30px) rotate(-30deg);
}

.card2:hover {
  transform: translateY(-30px) rotate(-15deg);
}

.card3:hover {
  transform: translateY(-30px) rotate(5deg);
}

/* Уровень 3 */
/* Я не сделал на всю ширину экрана, потому что не 
знаю какой у вас размер */
.square {
  width: 449px;
  height: 625px;
  position: absolute;
  right: 0;
  display: inline-block;
}
.moving-block {
  width: 100px;
  height: 100px;
  background: rgb(255, 0, 0);
  position: absolute;
  animation: moving 8s linear infinite normal both;
}

@keyframes moving {
  0% {
    top: 0;
    left: 0;
  }
  25% {
    top: 525px;
    left: 0;
    background: rgb(0, 0, 255);
  }
  50% {
    left: 349px;
    bottom: 0;
    background: rgb(3, 153, 3);
  }
  75% {
    bottom: 525px;
    right: 0;
    background: rgb(255, 255, 0);
  }
  100% {
    right: 349px;
    background: rgb(255, 0, 0);
  }
}