#banner-container {
  position: fixed;
  top: 55%;
  left: 50%;
  transform: translate(-50%,-50%);
  z-index: 1000;
}

.banner {
  background: linear-gradient(to right, #8ef5f5, #4682B4); /* degradado */
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
  width: 400px;
}

.banner2 {
  display: grid;
  grid: auto-flow / repeat(2, 180px);
  justify-content: space-evenly;
}

.texto-derecha {
 font-size: 13px;
 //font-weight: bold;
 //color: #333;
 margin-top: 30px;
 margin-left:30px;
 //width:80%; 

}

.cerrar {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 30px;
  cursor: pointer;
  color: #ccc;
}

.cerrar-btn:hover {
  color: #ccc;
}

.titulo {
  text-align: center;
}

.contenido {
  text-align: center;
}

.titulo-banner {
  font-size: 25px;
  color: #000;
  margin-top: 10px;
  margin-bottom: 20px;
  font-weight: bold;
}

.responsive-banner {
  margin: 1px ;
  width: 50%;
  min-width: 200px;
  max-width: 200px;
  position: relative;
  height: auto;
  min-height: 300px;
  max-height: 600px;
  border-radius: 10px;
  overflow: hidden;
  background-image: linear-gradient(to top right, #4682B4, #8ef5f5);
  background-repeat: no-repeat;
  box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
}
.container-envelope {
  padding: 30px 30px;
  color: #fff;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
}
.col-xs-12 {
  -webkit-box-flex: 0;
  -webkit-flex: 0 0 100%;
  -ms-flex: 0 0 100%;
  flex: 0 0 100%;
  max-width: 100%;
  -webkit-align-self: center;
  -ms-flex-item-align: center;
  align-self: center;
  text-align: center;
}

.contenido img {
  max-width : 250px;
  width: 100%;
  position: relative;
}

.contenido span:after,
.contenido span:before {
  content: "";
  position: absolute;
  display: block;
  border-radius: 50%;
  background-color: rgba(0, 0, 0, 0.1);
  width: 150px;
  height: 150px;
}

.circle-a:before {
  width: 500px;
  height: 500px;
  top: 80%; left: 95%;
  -webkit-transform: translate(-50%,0);
  -ms-transform: translate(-50%,0);
  transform: translate(-50%,0);
}

.circle-a:after {
  top: 80%;
  right: 70%;
}

 .circle-b:before {
  top: 60%;
  left: -15px;
}

.circle-b:after {
  width: 250px;
  height: 250px;
  bottom: -70px;
  right: 10px;
  top: 78%;
}

/* Demo Stuff */
p {
  clear: both;
  font-family: 'Work Sans', Helvetica, sans-serif;
  text-transform: none;
  text-rendering: optimizeLegibility;
  font-weight: 500;
  line-height: 1.15;
  word-wrap: break-word;
  margin: 1em 0 0.5em;
  margin: 0;
  padding: 0;
  color: #000;
  position: relative;
  word-wrap: break-word;
  font-size: 12px;
  text-transform: uppercase;
  margin-bottom: 20px;
}
* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
a.more-link {
  background-color: rgba(255, 255, 255, 0.35);
  display: inline-block;
  padding: 12px 18px;
  color: #fff;
  text-decoration: none;
  font: 500 15px 'Work Sans', Helvetica, sans-serif;
  line-height: 1.5;
  text-align: center;
  border: none !important;
  position: relative;
  border-radius: 20px;
  text-transform: uppercase;
  -webkit-transition: .1s all ease-in-out;
  -moz-transition: .1s all ease-in-out;
  -o-transition: .1s all ease-in-out;
  transition: .1s all ease-in-out;
}
a.more-link:hover {
  background-color: rgba(255, 255, 255, 0.50);
}

.link-container {
  text-align: center;
}
.link-container a.more-link {
  font-family: 'Source Sans Pro', Helvetica, sans-serif;
  background-color: #90b0bf;
  color: #fff;
  display: inline-block;
  margin-right: 5px;
  margin-bottom: 5px;
  line-height: 1.5;
  text-decoration: none;
  text-transform: none;
  font-weight: 400;
  letter-spacing: 1px;
}