diff --git a/src/noosfero-spb-theme/css/main-content.css b/src/noosfero-spb-theme/css/main-content.css
index 56307fb..e16e05d 100644
--- a/src/noosfero-spb-theme/css/main-content.css
+++ b/src/noosfero-spb-theme/css/main-content.css
@@ -86,7 +86,8 @@
     margin: 0 10px 10px 0;
 }
 
-#content a.button.with-text{
+#content a.button.with-text,
+.modal .button.with-text {
   height: 32px;
   padding: 5px 15px;
   background: #FFF none;
diff --git a/src/noosfero-spb-theme/css/modal.css b/src/noosfero-spb-theme/css/modal.css
new file mode 100644
index 0000000..58752e1
--- /dev/null
+++ b/src/noosfero-spb-theme/css/modal.css
@@ -0,0 +1,103 @@
+.modal {
+  position: fixed;
+  top: 0px;
+  right: 0px;
+  bottom: 0px;
+  left: 0px;
+  z-index: 1050;
+  display: none;
+  overflow: hidden;
+  outline: 0px none;
+  background-color: rgba(0, 0, 0, 0.5);
+}
+
+.modal-open .modal {
+  overflow-x: hidden;
+  overflow-y: auto;
+}
+
+.fade {
+  opacity: 0;
+  transition: opacity 0.15s linear 0s;
+}
+
+.fade.in {
+  opacity: 1;
+}
+
+.modal-dialog {
+  width: 600px;
+  margin: 60px auto;
+  position: relative;
+}
+
+.modal.in .modal-dialog {
+  transform: translate(0px, 0px);
+}
+
+.modal.fade .modal-dialog {
+  transition: transform 0.3s ease-out 0s;
+  transform: translate(0px, -25%);
+}
+
+.modal-content {
+  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.5);
+}
+
+.modal-content {
+  position: relative;
+  background-color: #FFF;
+  background-clip: padding-box;
+  border: 1px solid rgba(0, 0, 0, 0.2);
+  border-radius: 6px;
+  outline: 0px none;
+  box-shadow: 0px 3px 9px rgba(0, 0, 0, 0.5);
+}
+
+.modal-header {
+  min-height: 16.43px;
+  padding: 15px;
+  border-bottom: 1px solid #E5E5E5;
+}
+
+.modal-header .close {
+  margin-top: -2px;
+}
+
+.modal-header button.close {
+  padding: 0px;
+  cursor: pointer;
+  background: transparent none repeat scroll 0px 0px;
+  border: 0px none;
+}
+
+.modal-header .close {
+  float: right;
+  font-size: 21px;
+  font-weight: 700;
+  line-height: 1;
+  color: #000;
+  text-shadow: 0px 1px 0px #FFF;
+  opacity: 0.2;
+}
+
+.modal-title {
+  margin: 0px;
+  line-height: 1.42857;
+}
+
+.modal-body {
+  position: relative;
+  padding: 15px;
+}
+
+.modal-footer {
+  padding: 15px;
+  text-align: right;
+  border-top: 1px solid #E5E5E5;
+}
+
+
+.modal button.button.with-text {
+  padding: 0px 15px;
+}
diff --git a/src/noosfero-spb-theme/style.css b/src/noosfero-spb-theme/style.css
index df03cbc..224934d 100644
--- a/src/noosfero-spb-theme/style.css
+++ b/src/noosfero-spb-theme/style.css
@@ -25,6 +25,7 @@
 @import url(css/software-catalog-page.css);
 @import url(css/tooltip.css);
 @import url(css/popover.css);
+@import url(css/modal.css);
 
 @font-face{
   font-weight: normal;
--
libgit2 0.21.2