.head_right {
    position: relative;
    z-index: 5;
}

.head_left {
    position: relative;
    z-index: 10;
}

.back-to-top {
    background: #FFF;
    border-radius: 15px;
    -webkit-box-shadow: 0px 10px 15px 0px rgba(0,0,0,0.5);
    -moz-box-shadow: 0px 10px 15px 0px rgba(0,0,0,0.5);
    box-shadow: 0px 10px 15px 0px rgba(0,0,0,0.5);
    position: fixed;
    bottom:20px;
    right:20px;
    padding:0.5em;
    z-index: 100;
    width: 60px;
    height: 60px;
}

.back-to-top img {
    color: #222 !important;
}

  
  .carousel-cell {
    width: 100%;
    height: auto;
    margin-right: 10px;
    border-radius: 5px;
    counter-increment: gallery-cell;
  }
  
  /* cell number */
  .carousel-cell:before {
    display: block;
    text-align: center;
    content: counter(gallery-cell);
    line-height: 200px;
    font-size: 80px;
    color: white;
  }

  .buttons {
    text-align: center;
    width: 230px;
    display: block;
    margin-left: auto;
    margin-right: auto;
  }

  .phone{
      border-radius: 15px;
      background-color: #D9E021;
      float: left;
      padding: 20px 85px;
      margin-bottom: 25px;
  }

  .phone:hover{
      background-color: #8CC63F;
  }

  .phone img {
      width: 60px;
      height: auto;
  }

  .mail{
    border-radius: 15px;
    background-color: #FBB03B;
    float: left;
    padding: 25.5px 85px;
    margin-bottom: 25px;
   }

   .mail:hover{
    background-color: #F7931E;
   }

   .mail img {
    width: 60px;
    height: auto;
   }