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CSS

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HTML 

              
                <!-- !!! CODE DE DESIGNER !!! -->
<section class="video-box">
  <video class="bg-video" autoplay="autoplay" muted="muted" preload="auto" loop>
      <source src="http://ak0.picdn.net/shutterstock/videos/19842280/preview/stock-footage-close-up-portrait-school-girl-child-years-old-in-glasses-using-tablet-in-the-night-in-her-desk-a.mp4" type="video/webm">
</video><div class="overlay"></div>
  <div class="inner-container">
    <div class="box">
      <h1>Dites-nous comment vous aider ?</h1>
      <select name="sources" class="custom-select opened" id="dd1" placeholder="Quelle est votre situation ?">
    <option value="profile">Je déménage</option>
    <option value="word">Je rénove</option>
    <option value="hashtag">Je ne suis pas encore client</option>
<option value="hashtag">Je suis client</option>
  </select>
     <select name="sources" class="custom-select" id="dd2" placeholder="Quel est votre besoins ?">
    <option value="profile">Je veux payer ma facture</option>
    <option value="word">Je souhaite transférer mon contrat</option>
    <option value="hashtag">Je veux parler à un conseiller</option>
  </select>
     <select name="sources" class="custom-select" id="dd3" placeholder="Quel biens est concerné ?">
    <option value="profile">de ma maison</option>
    <option value="word">de mon logement</option>
  </select>
    </div>
  </div>
</section>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Titillium+Web:300,400,600,700,900');

* {
  box-sizing: border-box;
  font-family: Titillium Web !important;
  font-size: 16px;
  color: #FFFFFF;}
body{
  padding:0;
  margin:0;

}
.video-box{
  position:relative;
  height:100vh;
  overflow:hidden;
}

.bg-video{
  transform:scale(1.1);
  position:absolute;
  left:0;
  top:0;
  width:100vw;
  transition:all 0.5s ease-in-out;
}
.overlay{
  width:100vw;
  height:100vh;
  opacity: 0.4;
  background-image: linear-gradient(-180deg, #00FFBF 0%, #0075B4 50%, #4495D1 100%);
}
.overlay:after{
 display:block;
 content:"";
  width:100%;
  height:100%;
/* overlay-vignette: */
  opacity: 0.8;
  background-image: radial-gradient(50% 50%, rgba(27,52,89,0.00) 50%, rgba(68,149,209,0.00) 60%, rgba(27,52,89,0.60) 70%, #1B3459 80%);
}

.inner-container{
  width:1170px;
  height:340px;
  position:absolute;
  top:calc(50vh - 170px);
  left:calc(50vw - 585px);
}

h1{
  font-weight:700;
  font-size: 48px;
  color: #FFFFFF;
  line-height: 50px;
  text-shadow: 0 0 40px #1B3459;
}
.box{
  position:absolute;
  height:100%;
  width:100%;
  font-family:Helvetica;
  color:#fff;
  padding:30px 0px;
}
.box h1{
  text-align:center;
  margin:30px 0;
  font-size:30px;
}

.box input{
  width:320px;
  height:60px;
  padding:10px;
  background:rgba(0,0,0,0.2);
  color:#fff;
  border:0px;
  border-bottom: solid 1px white;
}
 .blurme{
  filter: url("data:image/svg+xml;utf9,<svg%20version='1.1'%20xmlns='http://www.w3.org/2000/svg'><filter%20id='blur'><feGaussianBlur%20stdDeviation='10'%20/></filter></svg>#blur");
  -webkit-filter:blur(10px);
  -ms-filter: blur(10px);
  -o-filter: blur(10px);
  filter:blur(10px);
}

.box input:focus,.box input:active,.box button:focus,.box button:active{
  outline:none;
}

/** Custom Select **/
.custom-select-wrapper {
  position: relative;
  display: inline-block;
  user-select: none;
}
  .custom-select-wrapper select {
    display: none;
  }
  .custom-select {
    position: relative;
    display: inline-block;
    
  }
    .custom-select-trigger {  
      display: block;  
      width:24em;  
      padding: 0 84px 0 22px;  
      font-size: 16px;  
      font-weight: 400;  
      color: #fff;  
      line-height: 60px;
      background:rgba(0,0,0,0.2);
      color:#fff;
      border:0px;
      border-bottom: solid 1px white;
      cursor: pointer;
    }
      .custom-select-trigger:after {
        position: absolute;
        display: block;
        content: '';
        width: 10px; height: 10px;
        top: 50%; right: 25px;
        margin-top: -3px;
        border-bottom: 1px solid #fff;
        border-right: 1px solid #fff;
        transform: rotate(45deg) translateY(-50%);
        transition: all .4s ease-in-out;
        transform-origin: 50% 0;
      }
      .custom-select.opened .custom-select-trigger:after {
        margin-top: 3px;
        transform: rotate(-135deg) translateY(-50%);
      }
  .custom-options {
    position: absolute;
    display: block;
    top: 100%; left: 0; right: 0;
    min-width: 100%;
    margin: 15px 0;
    border: 1px solid #b5b5b5;
    box-sizing: border-box;
    box-shadow: 0 2px 10px rgba(0,0,0,.4);
    background: #fff;
    transition: all .2s ease-in-out;
  
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-15px);
  }
  .custom-select.opened .custom-options {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
    transform: translateY(0);
  }
    .custom-options:before {
      position: absolute;
      display: block;
      content: '';
      bottom: 100%; right: 25px;
      width: 10px; height: 10px;
      margin-bottom: -5px;
      border-top: 1px solid #b5b5b5;
      border-left: 1px solid #b5b5b5;
      background: #fff;
      transform: rotate(45deg);
      transition: all .2s ease-in-out;
    }
    .option-hover:before {
      background: #f9f9f9;
    }
    .custom-option {
      position: relative;
      display: block;
      padding: 0 20px;
      border-bottom: 1px solid #b5b5b5;
      color: #303030;
      line-height: 40px;
      cursor: pointer;
      transition: all .4s ease-in-out;
    }
    .custom-option:first-of-type {
      border-radius: 4px 4px 0 0;
    }
    .custom-option:last-of-type {
      border-bottom: 0;
      border-radius: 0 0 4px 4px;
    }
    .custom-option:hover,
    .custom-option.selection {
      background: #f9f9f9;
      border-bottom:solid 1px #3869B2;
    }
!

JS 

              
                $('document').ready(function(){
  $('.inner-container').on('mouseover', function(){
    $('.bg-video').addClass('blurme');
  });
  $('.inner-container').on('mouseleave', function(){
    $('.bg-video').removeClass('blurme');
  });
});

$(".custom-select").each(function() {
  var classes = $(this).attr("class"),
      id      = $(this).attr("id"),
      name    = $(this).attr("name");
  var template =  '<div id="'+ id +'" class="' + classes + '">';
      template += '<span class="custom-select-trigger">' + $(this).attr("placeholder") + '</span>';
      template += '<div class="custom-options">';
      $(this).find("option").each(function() {
        template += '<span class="custom-option ' + $(this).attr("class") + '" data-value="' + $(this).attr("value") + '">' + $(this).html() + '</span>';
      });
  template += '</div></div>';
  
  $(this).wrap('<div id="'+id+'" class="custom-select-wrapper"></div>');
  $(this).hide();
  $(this).after(template);
});
$(".custom-option:first-of-type").hover(function() {
  $(this).parents(".custom-options").addClass("option-hover");
}, function() {
  $(this).parents(".custom-options").removeClass("option-hover");
});
$(".custom-select-trigger").on("click", function() {
  $('html').one('click',function() {
    $(".custom-select").removeClass("opened");
  });
  $('.custom-select').removeClass('opened');
  $(this).parents(".custom-select").toggleClass("opened");
  
  event.stopPropagation();
});
$(".custom-option").on("click", function() {
  $(this).parents(".custom-select-wrapper").find("select").val($(this).data("value"));
  $(this).parents(".custom-options").find(".custom-option").removeClass("selection");
  $(this).addClass("selection");
  $(this).parents(".custom-select").removeClass("opened");
  $(this).parents(".custom-select").find(".custom-select-trigger").text($(this).text());
  
  $(this).parent().parent().parent().next().children('.custom-select').addClass('opened');
  
});
!
999px

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