.img-responsive {
  display: block;
  height: auto;
  max-width: 100%;
}
.mb {
  margin-bottom: 15px;
}
.full-width {
  width: 100%;
}
.center-block {
  display: block;
  margin-left: auto;
  margin-right: auto;
}
.color-title{
    color: #000;
}