app/styles/ember-notification-collection.scss
// From https://github.com/Dogfalo/materialize/blob/master/sass/components/_global.scss
// Collections
.ember-notification-collection {
border-radius: 2px;
overflow: hidden;
position: relative;
// for some reason safari needs this
min-height: 1px;
.ember-notification-collection-item {
background-color: #fff;
line-height: 1.5rem;
padding: 10px 20px;
margin: 0;
border-bottom: 1px solid #e0e0e0;
text-align: left
}
}