.wpcf-7-db-progress-container{
  display: none;
  width: 100%;
  max-width: 400px;
  height: 20px;
  border: 1px solid #ccc;
  margin: 10px 0;
  position: relative;
}

.wpcf-7-db-progress-container.active{
  display: block;
}

.wpcf-7-db-progress-bar{
    background-color: #0bbb0b;
    left: 0;
    top: 0;
    height: 100%;
    width: 0;
    position: absolute;
    transition: width 0.25s;
}