<div class="container">
  <div class="content">
  <div class="box logo">Logo</div>
  <div class="unrundUndText">
    <div class="box unrund">Unrund</div>
    <div class="box text">Text</div>
  </div>
  <div class="buttonContainer">
    <div class="box buttonA">Los geht's</div>
    <div class="box buttonB">Mehr Info</div>
  </div>
  </div>
</div>
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 100%;
  min-height: 100%;
  background-color: lightblue;
  margin-bottom: 100px;
}

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

.box {
  display: flex;
  justify-content: center;
  align-items: center;
}

.logo {
  width: 300px;
  height: 100px;
  background-color: red;
}

.unrundUndText {
  position: relative;
  display: flex;
  flex-direction: column;
  background: salmon;
}

.text {
  width: 300px;
  height: 250px;
  background-color: blue;
  color: white;
}

.unrund {
  width: 300px;
  height: 450px;
  background-color: green;
}


.buttonContainer {
  position: fixed;
  left: 0;
  bottom: 0;
  padding-top: 5px;
  padding-bottom: 30px;
  background-color: white;
  width: 100%;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
}

.buttonA {
  width: 100px;
  height: 50px;
  background-color: yellow;
}

.buttonB {
  width: 100px;
  height: 50px;
  background-color: pink;
}

@media screen and (max-width: 800px) and (orientation:landscape) {
  .buttonContainer {
    justify-content: center;
    width: 300px;
    transform: translateX(-50%);
    margin-left: 50%;
  }
}

@media screen and (min-width: 800px) {
  .content {
    height: 600px;
  }
  
  .unrundUndText {
    width: 600px;
  }
  
  .unrund {
    position: absolute;
    left: 0;
    top: 0;
    background-color: gray;
    transform: translateX(100%);
  }
  
  .buttonContainer {
    position: initial;
    width: auto;
    flex-direction: column;
    background-color: violet;
    padding: 0;
    height: auto;
    flex: 2;
  }
}
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