Card skeleton (only html and css)

<div class="container">
  <div class="col-sm-6 col-md-3">
    <div class="main-card">
      <div style="height:190px; background:black"><spna style="color:white">Your Image</span>
      </div>
      <div class="loading-content">
        <div class="loading-text-container">
          <div >Main Title</div>
          <div>Sub Title</div>
        </div>
        <div><button>Submit</button></div>
      </div>
    </div>
  </div>
  <div class="col-sm-6 col-md-3">
    <div class="main-card">
      <div class="loading-image"></div>
      <div class="loading-content">
        <div class="loading-text-container">
          <div class="loading-main-text"></div>
          <div class="loading-sub-text"></div>
        </div>
        <div class="loading-btn"></div>
      </div>
    </div>
  </div>
</div>

<style>
  body {
  padding: 50px;
  background: #e3e3e3;
}

.main-card {
  height: 252px;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 15px;
}

.main-card .loading-image {
  height: 190px;
  background-image: -webkit-linear-gradient(left, #ececec 0px, #f4f4f4 40px, #ececec 80px);
  background-image: -o-linear-gradient(left, #ececec 0px, #f4f4f4 40px, #ececec 80px);
  background-image: linear-gradient(90deg, #ececec 0px, #f4f4f4 40px, #ececec 80px);
  background-size: 250px;
  -webkit-animation: shine-loading-image 2s infinite ease-out;
          animation: shine-loading-image 2s infinite ease-out;
}

.main-card .loading-content {
  background: #f7f7f7;
  padding: 15px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}

.main-card .loading-content .loading-text-container {
  -ms-flex-preferred-size: 100%;
      flex-basis: 100%;
}

.main-card .loading-content .loading-main-text {
  height: 10px;
  width: 65%;
  margin-bottom: 10px;
  background: #ececec;
  background-image: -webkit-linear-gradient(left, #ececec 0px, #ddd 40px, #ececec 80px);
  background-image: -o-linear-gradient(left, #ececec 0px, #ddd 40px, #ececec 80px);
  background-image: linear-gradient(90deg, #ececec 0px, #ddd 40px, #ececec 80px);
  background-size: 250px;
  border-radius: 10px;
  -webkit-animation: shine-loading-container-items 2s infinite ease-out;
          animation: shine-loading-container-items 2s infinite ease-out;
}

.main-card .loading-content .loading-sub-text {
  height: 10px;
  width: 50%;
  background: #ececec;
  background-image: -webkit-linear-gradient(left, #ececec 0px, #ddd 40px, #ececec 80px);
  background-image: -o-linear-gradient(left, #ececec 0px, #ddd 40px, #ececec 80px);
  background-image: linear-gradient(90deg, #ececec 0px, #ddd 40px, #ececec 80px);
  background-size: 250px;
  border-radius: 10px;
  -webkit-animation: shine-loading-container-items 2s infinite ease-out;
          animation: shine-loading-container-items 2s infinite ease-out;
}

.main-card .loading-content .loading-btn {
  width: 60px;
  height: 25px;
  background: #ececec;
  background-image: -webkit-linear-gradient(left, #ececec 0px, #ddd 40px, #ececec 80px);
  background-image: -o-linear-gradient(left, #ececec 0px, #ddd 40px, #ececec 80px);
  background-image: linear-gradient(90deg, #ececec 0px, #ddd 40px, #ececec 80px);
  background-size: 250px;
  border-radius: 3px;
  -webkit-animation: shine-loading-container-items 2s infinite ease-out;
          animation: shine-loading-container-items 2s infinite ease-out;
}


@-webkit-keyframes shine-loading-image {
  0% {
    background-position: -32px;
  }
  40%, 100% {
    background-position: 208px;
  }
}


@keyframes shine-loading-image {
  0% {
    background-position: -32px;
  }
  40%, 100% {
    background-position: 208px;
  }
}

@-webkit-keyframes shine-loading-container-items {
  0% {
    background-position: -100px;
  }
  40%, 100% {
    background-position: 140px;
  }
}

@keyframes shine-loading-container-items {
  0% {
    background-position: -100px;
  }
  40%, 100% {
    background-position: 140px;
  }
}
</style>

Find source code on github