100 height

by LuckyCat

HTML

<div class="slider-block">
  <div class="slider-item item-1 active">
  </div>
  <div class="slider-item item-2">
  </div>
  <div class="slider-item item-3">
  </div>
  <div class="slider-item item-4">
  </div>
  <div class="slider-item item-5">
  </div>
  <div class="slider-item item-6">
  </div>
</div>
  
<div class="wrapper">
  
  <div class="main-container">
    <div class="form-container">
https://codepen.io/chriswrightdesign/pen/emQNGZ/
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside a flex-direction:row (or just display:flex for simple)<br>
      You need to wrap any flex-direction:column inside...

CSS

@import url(https://fonts.googleapis.com/css?family=Open+Sans);

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  font-family: "Open sans", sans-serif;
  font-size: 100%;
  line-height: 1.5;
}


/* Background */
.slider-block {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: -1;
  overflow: hidden;
}

.slider-item {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-repeat: no-repeat;
  background-position: 50% 50%;
  background-size: cover;
  opacity: 0;
  transition: opacity 0.3s linear;
  -webkit-filter: blur(20px);
  filter: blur(20px)
}

.slider-item.active {
  opacity: 1;
}

.item-1 {
  background-image: url('girl1.jpg')
}

.item-2 {
  background-image: url('girl2.jpg')
}

.item-3 {
  background-image: url('girl3.jpg')
}

.item-4 {
  background-image: url('girl4.jpg')
}

.item-5 {
  background-image: url('girl5.jpg')
}

.item-6 {
  background-image: url('girl6.jpg')
}

.slider-block:after {
  content: "";
  display: block;
  position: fixed;
  background: rgba(0, 0, 0, 0.2);
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
}


.wrapper {
  display: flex;
  flex-direction: row;
  justify-content: center;
}

.main-container {
  min-height: 100vh;

  display: flex;
  align-items: center;

  padding: 65px;
}

.form-container {
  /* убрать, если хочешь блок просто посередине */
  height: 100%;
  
  max-width: 500px;
  padding: 1em;
  border-radius: 5px;
  /*max-width: 15em;*/

  background: #7b5a9e;
  color: #fff;
}