#fondo-slider {
    background-color: antiquewhite;
}

#c-slider {
  margin: 85px auto;
  width: 100%;
  max-width: 90%;
  height: 100%;
  position: relative;
  overflow: hidden;
    z-index: 2;
  box-shadow: 0 0 0 15px #ffcb20,
              2px 3px 8px 15px;
}

#slider {
  display: flex;
  width: 900%;
}
#slider section {
    width: 100%;
}

#slider img {
    display: block;
    width: 100%;
    height: 100%;
    
}

#btn-prev, #btn-next {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.7);
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  line-height: 40px;
  font-size: 30px;
  font-weight: bold;
  text-align: center;
  border-radius: 50%;
  font-family: monospace;
  cursor: pointer;
}

#btn-prev:hover, #btn-next:hover {
  background: white;
}

#btn-prev {
  left: 10px;
}

#btn-next {
  right: 10px;
}