style.css

html {
  box-sizing: border-box;
}
*,
*:after,
*:before {
  box-sizing: inherit;
  margin: 0;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  color: black;
  font-weight: 400;
  line-height: 1.2rem;
  font-size: 16px;
  background-color: black;
}

.dovolena {
  background-image: url(images/aloha.jpg);
  background-position: top;
  background-repeat: no-repeat;
  background-size: cover;
  height: 560px;
  width: 1000px;
  display: block;
  margin: auto;
  margin-top: 8vh;
  position: relative;
}

.uvod {
  display: flex;
  flex-direction: column;
}

h1 {
  text-align: center;
  color: white;
  font-family: "Merienda", cursive;
  font-size: 100px;
  font-weight: 700;
  margin-top: 10%;
}

h2,
.akce {
  text-align: center;
  color: white;
  font-weight: 400;
}

h2 {
  margin-top: 8%;
}

.akce {
  margin-top: 6%;
}

.tlacitko {
  display: block;
  margin: auto;
  width: 250px;
  text-transform: uppercase;
  text-decoration: none;
  letter-spacing: 0.1rem;
  background-color: #f15f42;
  color: white;
  padding: 15px 26px;
  border-radius: 5px;
  cursor: pointer;
}

.opice1 {
  height: 60%;
  position: absolute;
  bottom: -12%;
  left: -15%;
}

.opice2 {
  height: 60%;
  position: absolute;
  bottom: -12%;
  right: -15%;
}

.bublina1,
.bublina3 {
  height: 35%;
  position: absolute;
  bottom: -2%;
  left: 27%;
}

.bublina2,
.bublina4 {
  height: 35%;
  position: absolute;
  bottom: 4%;
  right: 24%;
}