Modal style : demo 100

HTML

(Icons : Fontawesome & CSS Framwork: Bootstrap)
                        

CSS

(Fonts required: Poppins)
                    .modal-box{ font-family: 'Poppins', sans-serif; }
                    .modal-box .show-modal{
                        color: #fff;
                        background: linear-gradient(#D00F08,#970505);
                        font-size: 18px;
                        font-weight: 600;
                        text-transform: capitalize;
                        padding: 10px 15px;
                        margin: 80px auto 0;
                        border: none;
                        border-radius: 0;
                        outline: none;
                        letter-spacing: 1px;
                        display: block;
                        transition: all 0.3s ease 0s;
                    }
                    .modal-box .show-modal:hover,
                    .modal-box .show-modal:focus{
                        color: #fff;
                        outline: none;
                        box-shadow: 0 0 10px rgba(0,0,0,0.5);
                    }
                    .modal-backdrop.in{ opacity: 0; }
                    .modal-box .modal-dialog{
                        width: 550px;
                        margin: 70px auto 0;
                    }
                    .modal.fade .modal-dialog{
                        transform: scaleX(0);
                        transition: all 400ms cubic-bezier(.47,1.64,.41,.8);
                    }
                    .modal.in .modal-dialog{ transform: scaleX(1); }
                    .modal-box .modal-dialog .modal-content{
                        background: linear-gradient(#555,#333);
                        text-align: center;
                        border-radius: 0;
                        border: none;
                    }   
                    .modal-box .modal-dialog .modal-content:before{
                        content: "";
                        background: linear-gradient(#D00F08,#970505);
                        width: 100px;
                        height: 100%;
                        position: absolute;
                        top: 0;
                        left: 0;
                    }
                    .modal-box .modal-dialog .modal-content .modal-body{ padding: 50px 30px 40px 110px !important; }
                    .modal-box .modal-dialog .modal-content .modal-body .modal-icon{
                        color:#fff;
                        font-size: 60px;
                        transform: translateY(-50%);
                        position: absolute;
                        top: 50%;
                        left: 20px;
                    }
                    .modal-box .modal-dialog .modal-content .modal-body .title{
                        color: #fff;
                        font-size: 30px;
                        font-weight: 400;
                        letter-spacing: 2px;
                        margin: 0 0 50px;
                    }
                    .modal-box .modal-dialog .modal-content .modal-body .btn{
                        color: #fff;
                        background: linear-gradient(#D00F08,#970505);
                        font-size: 22px;
                        font-weight: 300;
                        letter-spacing: 1px;
                        padding: 8px 12px;
                        margin: 0 8px;
                        border-radius: 0;
                        border: none;
                        transition: all 0.4s ease 0s;
                    }
                    .modal-box .modal-dialog .modal-content .modal-body .btn.cancel{
                        color: #fff;
                        background: linear-gradient(#73CB00,#4F8A02);
                    }
                    .modal-box .modal-dialog .modal-content .modal-body .btn:hover{
                        color: #fff;
                        text-shadow: 3px 3px rgba(0, 0, 0, 0.4);
                        box-shadow: 0 0 10px rgba(0,0,0,0.8);
                    }
                    .modal-box .modal-dialog .modal-content .modal-body .btn:focus{ outline: none; }
                    @media only screen and (max-width: 767px){
                        .modal-dialog{ width: 93% !important; }
                    }
                    @media only screen and (max-width: 479px){
                        .modal-box .modal-dialog .modal-content:before{
                            width: 100%;
                            height: 100px;
                        }
                        .modal-box .modal-dialog .modal-content .modal-body{ padding: 130px 20px 40px !important; }
                        .modal-box .modal-dialog .modal-content .modal-body .modal-icon{
                            transform: translateX(-50%) translateY(0);
                            left: 50%;
                            top: 10px;
                        }
                        .modal-box .modal-dialog .modal-content .modal-body .btn{
                            margin: 0 auto 10px;
                            display: block;
                        }
                    }
                    

JavaScript

(Modal depend on jQuery and Bootstrap.)
                        
                        
                    
License Terms