.bilder_klein {
  width: calc(50% - 6px);
  height: auto ;
  margin: 0 0px 3px 3px;
  }

.mySlides {
  width: 50%;
  height: auto ;
  }

.slide {
  position: relative;
  margin: 0px auto;
  width: 100%;
  background: #ccc;

 }

.slide:before{
        content: "";
        display: block;
        padding-top: 50%;         /* initial ratio of 1:1*/
}

.slide ul li {
  position: absolute;
  left: 0;
  top: 0;
  display: block;
  width: 100%;
  height: 100%;
  list-style: none;
}

.slide .dots {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 20px;
  width: 100%;
  z-index: 3;
  text-align: center;
}

.slide .dots li {
  display: inline-block;
  margin: 0 10px;
        width: 5px;
        height: 15px;
        border: 10px solid #fff;

     /*   border-radius: 50%;  */
  opacity: 0.6;
        cursor: pointer;
        transition: background .5s, opacity .5s;
  list-style: none;
}

.slide .dots li.active {
  background: #fff;
        opacity: 1;
}

.slide .arrow {
  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transition: background .5s, opacity .5s;
}

.slide .arrow .arrow-left,
.slide .arrow .arrow-right {
  position: absolute;
  top: 50%;
  margin-top: -25px;
  display: block;
  width: 50px;
  height: 50px;
  cursor: pointer;
  opacity: 0.5;
        transition: background .5s, opacity .5s;
}

.slide .arrow  .arrow-left:hover,
.slide .arrow  .arrow-right:hover {
  opacity: 1;
}

.slide .arrow .arrow-left {
  left: 20px;
  background: url("../img/arrow-left.png");
}

.slide .arrow .arrow-right {
  right: 20px;
  background: url("../img/arrow-right.png");
}