Ver el código de «Usuario:RVarela (WMSP)/Banner»

.responsive-banner {
  display: inline-block;
  margin: 50px;
  width: 60%;
  max-width: 1080px;
  min-width: 320px;
  position: relative;
  min-height: 90px;
  max-height: 320px;
  border-radius: 10px;
  overflow: hidden;
  background-image: linear-gradient(to bottom right, #ffffff, #eaecf0);
  background-repeat: no-repeat;
  text-align: left;
  box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
}
.container-envelope {
  max-width: calc(100%);
  padding: 15px;
  color: #fff;
   display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
  min-height: 70px;
  max-height: 120px;
}
.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: flex-end;
      -ms-flex-item-align: end;
          align-self: flex-end;
}

@media (min-width: 90px){
  .col-xs-12 {
    -webkit-align-self: center;
      -ms-flex-item-align: center;
      align-self: center;
  }
    .container-envelope {
    max-width: calc(100% - 200px);
  }
}
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: #202122;
    position: relative;
    word-wrap: break-word;
  font-size: 20px;
  text-transform: uppercase;
  margin-bottom: 10px;
}
* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
a.more-link {
    background-color: rgba(30, 150, 255, 0.35);
    display: inline-block;
    padding: 10px 10px;
    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: 30px;
  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(052, 102, 203, 0.50);
}
svg, img {
  fill: rgba(52, 102, 203, 0.1);
  position: absolute;
}
img {
  max-width : 50%;
}
.cirle-a {
  bottom: -80px;
  left: -80px;
}
.cirle-b {
  top: -30px;
  right: 70%;
}
.cirle-c {
  top: -330px;
  right: -300px;
}
.cirle-d {
  top: 195px;
      right: 145px;
}
img {
  top: 0;
  right: 0;
}

body {
  background-color: #ffff;
  margin-bottom: 50px;
  text-align: center;
}
html, button, input, select, textarea {
  font-family: 'Source Sans Pro', Helvetica, sans-serif;
  color: #2a4b8d;
}
h1 {
  text-align: center;
  margin: 30px 15px;
}
.link-container {
  text-align: center;
}
.link-container a.more-link {
  font-family: 'Source Sans Pro', Helvetica, sans-serif;
  background-color: #2a4b8d;
  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;
}

<aside class="responsive-banner first">
  <div class="container-envelope">
    <img src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Imagen_Banner_Proyecto_wikimedia.jpg/220px-Imagen_Banner_Proyecto_wikimedia.jpg"</a>
    <svg class="cirle-a" height="160" width="160">
      <circle cx="80" cy="80" r="80"/>
    </svg>
     <svg class="cirle-b" height="60" width="60">
      <circle cx="30" cy="30" r="30"/>
    </svg>
    <svg class="cirle-c" height="600" width="600">
      <circle cx="300" cy="300" r="300"/>
    </svg>
   <svg class="cirle-d" height="60" width="60">
      <circle cx="30" cy="30" r="30"/>
    </svg>
    
    <div class="col-xs-1">
      <p>¿QUIERES CONTRIBUIR A LOS PROYECTOS MAS PEQUEÑOS DE LA FUNDACION?</p>
      <a target="_blank" href="https://wikisp.org/wiki/Portal:SmallProjects/SP" class="more-link">si quiero</a>
    </div>
  </div>
</aside>