<div class="flex__container">
  <div class="flex__item">
    <div class="avatar"></div>
    <h4></h4>
    <p></p>
    <button></button>
  </div>
  <div class="flex__item">
    <div class="avatar"></div>
    <h4></h4>
    <p style="min-height: 120px"></p>
    <button></button>
  </div>
  <div class="flex__item">
    <div class="avatar"></div>
    <h4></h4>
    <p style="min-height: 200px"></p>
    <button></button>
  </div>
</div>

* {
  box-sizing: border-box;
}

body {
  width: 100vw;
  min-height: 100vh;
  background-color: #f2f2f2;
  padding: 1vh;
}

.flex__container {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  
  width: 100%;
}

.flex__item {
  background-color: #fff;
  border-radius: 4px;
  
  display: flex;
  flex-direction: column;
  align-items: center;
  
  flex: 1 1 25vw;
  min-width: 300px;
  box-shadow: 0 0 2px rgba(0, 0,0, .25);
  padding: 20px;
  margin: 0 2vh;
}

.avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  background-color: #607D8B;
}

h4 {
  background-color: #607D8B;
  width: 80%;
  border-radius: 4px;
  height: 20px;
  margin-bottom: 10px;
}

p {
  width: 100%;
  height: 100px;
  background-image: linear-gradient(to bottom, #607D8B 0%, #607D8B 80%, transparent 80%, transparent 100%);
  background-size: 100% 26px;
  background-repeat-y: repeat;
  margin-bottom: 20px;
}

button {
  min-width: 50%;
  height: 30px;
  border-radius: 4px;
  background-color: #607D8B;
  border: none;
  margin-top: auto;
  align-self: flex-start;
}