.todo{
	background-color: FAFAFA;
}

.menu {
    position: fixed;
    list-style: none;
    background: #1C1C1C;
    z-index: 50;
    display: flex;
    justify-content: center;
    font-family: 'Roboto', sans-serif;
	font-size: 14;
    margin-top: 0px;
    width: 100%;
    box-shadow: 0px 1px 1px #636363;
}

.empty {
	background-color: black;
    left: 0;
    right: 0;
    top: 0;
    padding: 20px;
    opacity: 0;
    width: 100%;
}

.left {
	margin-left:60px;
    float: left;
    width: 50%;
}

.right {
    margin-left: 50%;
	margin-right:20px;
}

.menu > li {
    list-style: none;
    float: left;
    position: relative;
    padding: 0 10px;
}

.menu >li:hover {
	color: black;
	background-color: #5D9BF2;
}

.menu li ul {
    transition: opacity 1s;
    opacity: 0;
    height: 0;
    width: 100%;
    position: absolute;
    background: #f4f4f4;
    box-shadow: 0px 2px 10px #636363;
    z-index: 80;
    font-size: 100px;
    overflow: hidden;
    padding: 0px 5px;
}

.menu li:hover > ul {
    opacity: 1;
    height: auto;
    list-style: none;
    font-size: 15px;
}

.menu:hover {}

.menu li ul li {
    position: relative;
    min-width: 100%;
}

.menu-item:link,
.menu-item:visited {
    display: block;
    transition: color 0.8s;
    color: white;
    text-decoration: none;
    margin: 3px 0px;
}

.menu-item1:link,
.menu-item1:visited {
    display: block;
    transition: color 0.8s;
    color: black;
    text-decoration: none;
    margin: 3px 0px;
}

.menu-item:hover,
.menu-item:active{
    color: black;
    text-decoration: none;
}

.menu-item1:hover,
.menu-item1:active{
	font-weight: bold;
    text-decoration: none;
}

.menu li > .menu-item {
    padding: .5em .9em;
}

.menu li > .menu-item1 {
    padding: .5em .9em;
}

.menu-text {
    padding: .5em 0;
    color: black;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
	background-color: black
}

.titulo-principal{
	color: white;
	font-size:75px;
	font-family:serif;
	padding-top: 170px;
	border-color: black;
	border-width: 5px;
	margin-left: 120px;
	margin-right: 120px;
	margin-bottom:5px;
}

.titulo{

	color: 7399FF;
	font-size: 70px;
	font-family: serif;
	margin-left: 110px;
	margin-right: 100px;
}


#intro1, #history1, #evolution1, #philosophy1,
#advantage_disadvantage1, #desventajas,
#principios, #languages1, #concepts1, #examples,
#applications1, #abstraccion, #modularidad,
#polimorfismo, #herencia, #encapsulamiento,
#buenaspracticas{
	color: gray;
}

.head{
	height: 535px;
	width: 100%;
	background: url(images/77.png);
	opacity: 0.8;
	background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;

}

.container {
	color: black;
	/*background-color: green;*/

}

#ventajas{
	border-color: black;
	border-width: 5;
	border-style: solid;
}

#lenguajes{
	margin-left:30px;
}

#lenguajes1{
	border-color: black;
	border-width: 4;
	border-style: solid;
	height: 55%;
	width: 80%;
}
.footer-text{
	/*width: 400px;*/
}

.btn-circle {
  width: 50px;
  height: 50px;
  margin-top: 40px;
  padding: 0px 0;
  border: 3px solid white;
  border-radius: 100% !important;
  font-size: 26px;
  color: white;
  background: transparent;
  -webkit-transition: background .3s ease-in-out;
  -moz-transition: background .3s ease-in-out;
  transition: background .3s ease-in-out; }
  .btn-circle:hover, .btn-circle:focus {
    outline: none;
    color: white;
    background: rgba(255, 255, 255, 0.1); }