[Bootstrap 3] form-group-vertical Class

style.css

.form-group-vertical .form-control:focus {
  border-color: #cccccc;
  outline: 0;
  -webkit-box-shadow: none;
  box-shadow: none;
}
.form-group-vertical .form-group {
  margin-bottom: 0px;
}
.form-group-vertical .form-group input {
  border-bottom-width: 0px;
  border-radius: 0px;
}
.form-group-vertical .form-group:focus {
  box-shadow: none;
  border-color: #cccccc;
}
.form-group-vertical .form-group:first-child input {
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
}
.form-group-vertical .form-group:last-child {
  margin-bottom: 15px;
}
.form-group-vertical .form-group:last-child input {
  border-bottom-left-radius: 4px;
  border-bottom-right-radius: 4px;
  border-bottom-width: 1px;
}

style.less

.form-group-vertical{
    .form-control:focus {
      border-color: #cccccc;
      outline: 0;
      -webkit-box-shadow: none;
      box-shadow: none;
    }
    .form-group{
        margin-bottom:0px;
        input{
            border-bottom-width: 0px;
            border-radius: 0px;
        }
        &:focus{
            box-shadow: none;
            border-color: #cccccc;
        }
    }


    .form-group:first-child input{
        border-top-left-radius: 4px;
        border-top-right-radius: 4px;
    }

    .form-group:last-child {
        margin-bottom: 15px;

        input{
            border-bottom-left-radius: 4px;
            border-bottom-right-radius: 4px;
            border-bottom-width: 1px;                
        }
    }
}