#slider {
   margin: 0 auto;
   width: 100%;
   max-width: 100%;
   height: fit-content;
   text-align: center;
   overflow-x: hidden;
}
#slider input[type=radio] {
   display: none;
}
#slider label {
   cursor:pointer;
   text-decoration: none;
}
#slides {
   padding: 10px;
   border: 3px solid #ccc;
   background: #fff;
   position: relative;
   z-index: 1;
}
#overflow {
   width: 100%;
   overflow: hidden;
}
#slide1:checked ~ #slides .inner {
   margin-left: 0;
}
#slide2:checked ~ #slides .inner {
   margin-left: -100%;
}
#slide3:checked ~ #slides .inner {
   margin-left: -200%;
}
#slide4:checked ~ #slides .inner {
   margin-left: -300%;
}
#slides .inner {
   transition: margin-left 800ms cubic-bezier(0.770, 0.000, 0.175, 1.000);
   width: 400%;
   line-height: 0;
   height: 550px;
}
#slides .slide {
   width: 25%;
   float:left;
   display: flex;
   justify-content: center;
   align-items: center;
   height: 100%;
   color: #fff;
}

#controls {
   margin: -180px 0 0 0;
   width: 100%;
   height: 50px;
   z-index: 3;
   position: relative;
}
#controls label {
   transition: opacity 0.2s ease-out;
   display: none;
   width: 50px;
   height: 50px;
   opacity: .4;
}
#controls label:hover {
   opacity: 1;
}
#slide1:checked ~ #controls label:nth-child(2),
#slide2:checked ~ #controls label:nth-child(3),
#slide3:checked ~ #controls label:nth-child(4),
#slide4:checked ~ #controls label:nth-child(1) {
   background: url(https://image.flaticon.com/icons/svg/130/130884.svg) no-repeat;
   float:right;
   margin: 0 -50px 0 0;
   display: block;
}
#slide1:checked ~ #controls label:nth-last-child(2),
#slide2:checked ~ #controls label:nth-last-child(3),
#slide3:checked ~ #controls label:nth-last-child(4),
#slide4:checked ~ #controls label:nth-last-child(1) {
   background: url(https://image.flaticon.com/icons/svg/130/130882.svg) no-repeat;
   float:left;
   margin: 0 0 0 -50px;
   display: block;
}
#bullets {
   margin: 150px 0 0;
   text-align: center;
}
#bullets label {
   display: inline-block;
   width: 10px;
   height: 10px;
   border-radius:100%;
   background: #ccc;
   margin: 0 10px;
}
#slide1:checked ~ #bullets label:nth-child(1),
#slide2:checked ~ #bullets label:nth-child(2),
#slide3:checked ~ #bullets label:nth-child(3),
#slide4:checked ~ #bullets label:nth-child(4) {
   background: #444;
}
@media screen and (max-width: 900px) {
   #slide1:checked ~ #controls label:nth-child(2),
   #slide2:checked ~ #controls label:nth-child(3),
   #slide3:checked ~ #controls label:nth-child(4),
   #slide4:checked ~ #controls label:nth-child(1),
   #slide1:checked ~ #controls label:nth-last-child(2),
   #slide2:checked ~ #controls label:nth-last-child(3),
   #slide3:checked ~ #controls label:nth-last-child(4),
   #slide4:checked ~ #controls label:nth-last-child(1) {
      margin: 0;
   }
   #slides {
      max-width: calc(100% - 20px);
      margin: 0 auto;
   }

   #slides .slide{
    -webkit-background-size: cover;
    background-size: cover;
  }

   #slides .inner{
      height: 175px;
   }

   h2 {
      font-size: calc(0.7rem + .9vw);
   }
}

@media screen and (max-width: 500px) {

  #slides .slide{
    -webkit-background-size: cover;
    background-size: cover;
     height: 125px;
  }

   #slides .inner{
      height: 125px;
   }

}