/* =Reset default browser CSS. Based on work by Eric Meyer: http://meyerweb.com/eric/tools/css/reset/index.html
-------------------------------------------------------------- */
body {
  line-height: 1;
  background-image:url(sigifundo.jpg); 
  opacity: 0.8;
  background-size:auto;
  width:100%;
  height:100%;
  background-repeat: no-repeat;
  }
  
#formulario{
font-size:12px;
width:40%; padding:5px; height:auto; background: #CCCCCC; color:#000000; border:0px #cccc solid;
position:absolute; left:40%; top:15%; margin-left:-150px; margin-top:-40px; -webkit-box-shadow: 0px 0px 0px 0px #FF9D3C;}

/* max-width  */
@media screen and (max-width: 600px) {
	#formulario {
		font-size:12px;
width:auto; padding:5px; height:auto; background: #CCCCCC; color:#000000; border:0px #cccc solid;
position:absolute; left:40%; top:15%; margin-left:-150px; margin-top:-40px; -webkit-box-shadow: 0px 0px 0px 0px #FF9D3C;}

}

/* min-width */
@media screen and (min-width: 900px) {
	#formulario {
		font-size:12px;
width:40%; padding:5px; height:auto; background: #CCCCCC; color:#000000; border:0px #cccc solid;
position:absolute; left:40%; top:15%; margin-left:-150px; margin-top:-40px; -webkit-box-shadow: 0px 0px 0px 0px #FF9D3C;}
}

/* min-width & max-width */
@media screen and (min-width: 600px) and (max-width: 900px) {
	#formulario {
		font-size:12px;
width:auto; padding:5px; height:auto; background: #CCCCCC; color:#000000; border:0px #cccc solid;
position: fixed; left:60%; top:20%; margin-left:-350px; margin-top:-60px; -webkit-box-shadow: 0px 0px 0px 0px #FF9D3C;}
}

/* max device width */
@media screen and (max-device-width: 480px) {
	#formulario {
		font-size:12px;
width:auto; padding:5px; height:auto; background: #ccc; color:#000000; border:0px #cccc solid;
position:absolute; left:40%; top:15%; margin-left:-150px; margin-top:-40px; -webkit-box-shadow: 0px 0px 0px 0px #FF9D3C;}
}

<style>
.alertsigi {
  padding: 10px;
  background-color: #f44336;
  color: white;
  font-size:8px;
  border: 0px solid red;
  border-radius: 5px;
}
.alertsigi.success {background-color: #04AA6D; line-height:12px; padding:5px}
.alertsigi.info {background-color: #87CEFA; line-height:12px; padding:5px; font-size:10px;}
.alertsigi.warning {background-color: none; color:#FF0000; line-height:10px; padding:2px; font-size:10px; border:#FF4500 solid 1px;}

.closebtnsigi {
  margin-left: 15px;
  color: white;
  font-weight: bold;
  float: right;
  font-size: 12px;
  line-height: 20px;
  cursor: pointer;
  transition: 0.3s;
}
.closebtnsigi:hover {
  color: black;
}
div.atrasformar {
  text-transform: uppercase;
}

div.btrasformar {
  text-transform: lowercase;
}

div.ctrasformar {
  text-transform: capitalize;
}