#header {
  background-image: url('../img/header-bg.jpg');
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center top;
  background-attachment: fixed;
}
#header-center {
  width: 610px;
  margin: auto;
  overflow: hidden;
  padding: 25px 0;
}
#logo {
  float: left;
  margin-right: 25px;
}
#header-center h1 {
  font-family: 'Oswald', sans-serif;
  color: white;
  text-transform: uppercase;
  font-size: 22px;
  line-height: 30px;
}
#filtra {
  background-color: #f3f2f0;
  padding: 20px 0;
  border-bottom: solid 1px #ccc;
}
#filtra-center {
  width: 1024px;
  margin: auto;
  overflow: hidden;
}
#filtra-center p {
  font-family: 'Source Sans Pro', sans-serif;
  float: left;
  font-size: 18px;
  color: #111;
  padding-top: 5px;
}
#pulsanti-filtra {
  float: right;
}
#pulsanti-filtra button {
  font-family: 'Source Sans Pro', sans-serif;
  font-size: 18px;
  display: inline-block;
  padding: 5px 20px;
  vertical-align: middle;
  margin: 5px;
  border-radius: 20px;
  border: solid 1px #ccc;
  cursor: pointer;
  background-color: #fff;
  transition: all 0.3s linear;
}
#pulsanti-filtra button:hover {
  background-color: #2ea3f2;
  color: #fff;
  border: solid 1px #2ea3f2;
}
#pulsanti-filtra button.is-checked {
  background-color: #2ea3f2;
  color: #fff;
  border: solid 1px #2ea3f2;
}
.main-concorsi {
  padding: 25px 0;
}
.concorsi {
  width: 1366px;
  margin: auto;
  overflow: hidden;
}
.overlay {
  opacity: 0;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(46,163,242,0.8);
  transition: all 0.3s linear;
}
.overlay i {
  width: 30px;
  height: 30px;
  display: block;
  color: #fff;
  font-size: 30px;
  left: 50%;
  top: 50%;
  position: absolute;
  margin-left: -15px;
  margin-top: -15px;
}
.concorsi a:link, .concorsi a:visited {
  display: block;
  float: left;
  position: relative;
  width: 31%;
  margin: 1%;
  background-color: #fff;
  border: solid 1px #fbfbfb;
  padding: 50px 10px;
  transition: all 0.3s linear;
  box-shadow: 0 0 10px -3px rgba(0,0,0,0.2);
}
.concorsi a:hover .overlay {
  opacity: 1;
  transition: all 0.3s linear;
}
.concorsi a span {
  display: block;
  text-align: center;
  font-family: 'Source Sans Pro', sans-serif;
}
.titolo {
  font-family: 'Oswald', sans-serif;
  font-size: 26px;
  color: #2ea3f2;
  font-weight: 800;
}
.sottotitolo {
  font-size: 16px;
  color: #000;
  font-weight: 300;
}

@media only screen and (max-width : 1366px) {
  .concorsi {
    width: 1170px;
  }
  .concorsi a:link, .concorsi a:visited {
    width: 48%;
  }
}
@media only screen and (max-width : 1170px) {
  .concorsi {
    width: 1024px;
  }
}
@media only screen and (max-width : 1024px) {
  #filtra-center {
    width: 768px;
  }
  #filtra-center p {
    float: none;
    margin-bottom: 10px;
  }
  #pulsanti-filtra {
    float: none;
  }
  #pulsanti-filtra button {
    font-size: 16px;
    padding: 5px 20px;
    margin: 5px;
  }
  .concorsi {
    width: 768px;
  }
  .concorsi a:link, .concorsi a:visited {
    width: 98%;
  }
}
@media only screen and (max-width : 768px) {
  #header-center {
    width: 480px;
  }
  #logo {
    float: none;
    display: block;
    margin: 0 auto 25px;
    width: 300px;
    height: auto;
  }
  #header-center h1 {
    text-align: center;
  }
  #filtra-center {
    width: 480px;
  }
  .concorsi {
    width: 480px;
  }
}
@media only screen and (max-width : 480px) {
  #header-center {
    width: 360px;
  }
  #filtra-center {
    width: 360px;
  }
  #filtra-center p {
    text-align: center;
  }
  #pulsanti-filtra button {
    display: block;
    text-align: center;
    margin: 10px auto;;
  }
  .concorsi {
    width: 360px;
  }
}
@media only screen and (max-width : 360px) {
  #header-center {
    width: 100%;
  }
  #filtra-center {
    width: 100%;
  }
  .concorsi {
    width: 100%;
  }
}