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HTML 

              
                .app(ng-app='app', ng-controller='ctrl')
  header
    h1 News Feed
  .news-categories(ng-init='newsCategory = "business"')
    .news-category(ng-repeat='category in categories', ng-click='$parent.newsCategory = category; getSources()', class='{{category}}')
      i.ion.ion-checkmark(ng-show='$parent.newsCategory == category')
      span {{ category == "science-and-nature" ? "science" : category }}
  .news-sources
    .news-source(ng-repeat='source in sources', ng-click='$parent.newsSource = source.id; getArticles()', style='background-image: url({{ source.urlsToLogos.large }})')
      i.ion.ion-checkmark(ng-show='$parent.newsSource == source.id')


  main.news-feed
    a.news-feed__article(ng-repeat='article in articles', href='{{ article.url }}')
      h3.news-feed__article__title {{ article.title }}
      img.news-feed__article__image(src='{{ article.urlToImage }}')
      p.news-feed__article__description {{ article.description }}
      small.news-feed__article__author {{ article.author }}
!

CSS 

              
                
*
  margin: 0
  padding: 0
  box-sizing: border-box
  line-height: 1.35
  font:
    weight: 300
    family: 'Roboto', sans-serif

body, p
  color: #424242
 
h1, h2, h3, h4, h5, h6
  color: #212121
  text-align: center
  
.business
  background: #f44336
.entertainment
  background: #E91E63
.gaming
  background: #9C27B0
.general
  background: #673AB7
.music
  background: #3F51B5
.science-and-nature
  background: #2196F3
.sport
  background: #00BCD4
.technology
  background: #009688
  
.ion
  position: absolute
  top: 50%
  left: 50%
  transform: translate(-50%,-50%)
  font-size: 2.5em
  text-shadow: 1px 1px rgba(0,0,0,0.66)
  color: #4CAF50
  
.news-sources
  display: flex
  flex-wrap: wrap
  justify-content: space-around
  
  .news-source
    position: relative
    display: flex
    align-items: center
    justify-content: center
    text-transform: capitalize
    border: 1px solid white
    width: calc(25% - 0.66em)
    height: 25vw
    cursor: pointer
    background:
      size: contain
      position: center
      repeat: no-repeat
    .ion
      font-size: 15vmin
      


.news-categories
  display: flex
  flex-wrap: wrap
  .news-category
    position: relative
    display: flex
    align-items: center
    justify-content: center
    text-transform: capitalize
    border: 1px solid white
    text-shadow: 1px 1px rgba(0,0,0,0.33)
    color: white
    width: 25%
    height: 3em
    cursor: pointer
    &.active
      background: green
    
.news-feed
  padding: 0.33em
  display: flex
  flex-wrap: wrap
  justify-content: center
  &__article
    display: flex
    flex-direction: column
    justify-content: space-between
    margin: 0 auto
    text-decoration: none
    border-radius: 2px
    padding: 0.66em
    margin: 0.5em
    max-width: 60ch
     
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24)
    transition: all 0.3s cubic-bezier(.25,.8,.25,1)

    &:hover 
      box-shadow: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22)
    
    > * + *
      margin: 0.66em auto 0 auto
    &__title
      text-align: center
    &__image
      width: 100%
      height: auto
      display: block
    &__description
      max-width: 60ch
    &__url
      display: block
      border: none
      background: none
      border-radius: 2px
      width: 11ch
      box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24)
      transition: all 0.3s cubic-bezier(.25,.8,.25,1)

      &:hover 
        box-shadow: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22)
    &__author
      color: #616161
      text-align: right
  
    


body
  /* ===== == = === Base Styles === = == ===== */
  font-size: 11px
  .news-feed__article
    width: calc(100% - 1rem)

  /* ===== == = === 20em (320px) === = == ===== */
  @media (min-width : 20rem)
    font-size: 12px
      
  /* ===== == = === 30em (480px) === = == ===== */
  @media (min-width : 30rem)
    font-size: 13px
    .news-feed__article
      width: calc(50% - 1em)
      
  /* ===== == = === 37.5em (600px) === = == ===== */
  @media (min-width: 37.5rem)
    font-size: 13.75px


  /* ===== == = === 48em (768px) === = == ===== */
  @media (min-width : 48rem)
    font-size: 14.8px
    .news-feed__article
      width: calc(25% - 1em)
  /* ===== == = === 62.25em (992px) === = == ===== */
  @media (min-width : 62em)
    font-size: 16.2px


  /* ===== == = === 68.75em (1100px) === = == ===== */
  @media (min-width : 68.75rem)
    font-size: 16.875px
    .news-feed__article
      width: calc(20% - 1em)

  /* ===== == = === 81.25em (1300px) === = == ===== */
  @media (min-width : 81.25rem)
    font-size: 18.125px
!

JS 

              
                var app = angular.module('app', []);

app.controller('ctrl', ['$scope', '$http', function($scope, $http) {

  $scope.newsCategory   = 'business';
  $scope.newsSource     = 'bloomberg';
  
  $scope.getSources = function() {
  $http({
  method: 'GET',
  url: 'https://newsapi.org/v1/sources',
  params: {
    language: 'en',
    category: $scope.newsCategory
  }
}).then(function successCallback(response) {
    $scope.sources = response.data.sources;
  }, function errorCallback(response) { 
    console.error( response );
  });
  };
  
  
  $scope.getArticles = function() {
    $http({
      method: 'GET',
      url: 'https://newsapi.org/v1/articles',
      params: {
        source: $scope.newsSource,
        apiKey: '3bddb1bdbb1948f9b1728a78184a0979'
      }
    }).then(function successCallback(response) {    
      $scope.articles = response.data.articles;
    }, function errorCallback(response) {
      console.error( response );
    });
  };
  
  $scope.getSources();
  $scope.getArticles();
  
  $scope.categories = ['business', 'entertainment', 'gaming', 'general', 'music', 'science-and-nature', 'sport', 'technology']
  

  
  
}]);
!
999px

Console