*{margin: 0; padding: 0;}

.slider {
    margin: 0 auto;
    position: relative;
    width: 100%;
    height: auto;
    padding-bottom: 40%;
    user-select: none;
    background-color: #1c1c1c;
    font-size: 25px;
}
.slider input { display: none; }

.slider .slide_img {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: -1;
}
.slider .slide_img div {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    text-align: center;
    color: white;
}
.slider .slide_img div a { 
    padding: 15px 50px;
    margin-top: 20px;
    display: inline-block;
    color: white;
}

.slider .slide_img img {
  width: inherit;
  height: inherit;
}
.slider .slide_img .prev, 
.slider .slide_img .next {
  width: 200px;
  height: inherit;
  position: absolute;
  top: 0;
  z-index: 99;
  transition: .45s;
  cursor: pointer;
}
.slider .slide_img .next { right: 0; }
.slider .slide_img .prev { left: 0; }

.slider .slide_img .prev:hover, 
.slider .slide_img .next:hover {
  transition: .3s;
}
.slider .slide_img .prev span, 
.slider .slide_img .next span {
    position: absolute;
    width: 50px;
    height: 50px;
    line-height: 50px;
    top: 50%;
    transform: translate(-50%, -50%);
    border-radius: 10px;
    background-color: rgba(255, 255, 255, 0.5);
    text-align: center;
    transition: all .7s;
    opacity: 0;
}
.slider .slide_img .prev span{ left: 25%; }

.slider .slide_img:hover .prev span{
    left: 50%;
    opacity: 1;
}
.slider .slide_img .next span{ left: 75%; }

.slider .slide_img:hover .next span{
    left: 50%;
    opacity: 1;
}

.slider #nav_slide {
  width: 100%;
  bottom: 7%;
  height: 11px;
  position: absolute;
  text-align: center;
  z-index: 99;
  cursor: default;
}
.slider #nav_slide .dots {
  top: -5px;
  width: 18px;
  height: 18px;
  margin: 0 3px;
  position: relative;
  border-radius: 100%;
  display: inline-block;
  background-color: rgba(0, 0, 0, 0.6);
  transition: .4s;
  cursor: pointer;
}
.slider #nav_slide #dot1:hover {
  background: #00507a;
}
.slider #nav_slide #dot2:hover {
  background: #00507a;
}
.slider #nav_slide #dot3:hover {
  background: #00507a;
}
.slider #nav_slide #dot4:hover {
  background: #00507a;
}

#i1:checked ~ #one,
#i2:checked ~ #two,
#i3:checked ~ #three,
#i4:checked ~ #four {
  z-index: 9;
  animation: scroll 1s ease-in-out;
}

#i1:checked ~ #nav_slide #dot1 {
  background: #00957f;
}

#i2:checked ~ #nav_slide #dot2 {
  background: #00957f;
}

#i3:checked ~ #nav_slide #dot3 {
  background: #00957f;
}

#i4:checked ~ #nav_slide #dot4 {
  background: #00957f;
}

@keyframes scroll {
  0% {
    opacity: .4;
  }
  100% {
    opacity: 1;
  }
}

@media (max-width:1100px){

    .slider .slide_img div {
        width: 90%;
    }
}

@media (max-width:550px){  /* 1 colunas */
    
    .slider .slide_img div {
        width: 100%;
    }
    .slider .slide_img div h1{
        font-size: 1em
    }
    .slider .slide_img div h2{
        font-size: .7em
    }
    .slider .slide_img div .bt-1{
        padding: 10px;
        font-weight: bold;
        margin-top: 10px;
        font-size: .5em;
    }
}