.slider {
	width: 100%;
	margin: auto;
	overflow: hidden;
    background-color: black;
    height: 570px;
}

.slider ul {
	display: flex;
	padding: 0;
	width: 400%;
	
	animation: cambio 20s infinite;
}

.slider li {
	width: 100%;
	list-style: none;
    
}

.slider img {
	width: 100%;
    background-color: rgba(0,0,0,0.7); filter:brightness(0.5);
}
.sliderportafolio {
	width: 100%;
	margin: auto;
	overflow: hidden;
    text-align: center;
    justify-content: center;
    vertical-align: middle;
}

.sliderportafolio ul {
	display: flex;
	padding: 0;
	width: 200%;
	animation: cambioportafolio 10s infinite;
}

.sliderportafolio li {
	width: 100%;
	list-style: none;
    
}

.sliderportafolio img {
	width: 100%;
}
.navbar-nav{
        display: flex;
    font-size: 20px; 
    margin-top: -60px;
    text-align: right;width: 100%;
    justify-content: flex-end;
    }
@keyframes cambio {
	0% {margin-left: 0;}
	20% {margin-left: 0;}
	
	25% {margin-left: -100%;}
	45% {margin-left: -100%;}
	
	50% {margin-left: -200%;}
	70% {margin-left: -200%;}
	
	75% {margin-left: -300%;}
	100% {margin-left: -300%;}
}
@keyframes cambioportafolio{
	0% {margin-left: 0;}
	45% {margin-left: 0;}
	
	50% {margin-left: -100%;}
	100% {margin-left: -100%;}
	
}
  #btmenu{
        display:none;
    }
@media only screen and (max-width: 900px) {
    .slider{
        height: 285px; 
    }
    .navbar-nav{
        display: none;margin-top: 20px;
        justify-content: center;
    }
    #logo{
        height: 65px;
    }
  .navbar-nav li{
    display: block;
      text-align: center;
      width: 100%;
      margin-left: 0;
  }
    #btmenu{
        display: flex;
    }
}