.bl_demo{margin-left:auto;margin-right:auto;max-width:640px;position:relative}.bl_demo_screen{left:0;margin:auto;max-width:100%;position:absolute;right:0;top:4.5%;width:77%;z-index:500}.bl_demo_mock{max-width:100%;width:100%}.bl_demo_bg{background:rgba(0,0,0,.7);height:70%;max-width:100%;top:-21%;width:77%;z-index:550}.bl_demo_bg,.bl_demo_desc{bottom:0;left:0;margin:auto;position:absolute;right:0}.bl_demo_desc{display:flex;flex-direction:column;justify-content:center;padding:0 96px;top:-15%;z-index:570}.bl_demo_btn,.bl_demo_desc{text-align:center}.bl_demo_ttl{color:#fff;font-size:2.2rem;font-weight:700;margin-top:28px}.bl_demo_txt{color:#fff;margin-top:7px}.bl_demo_spTtl{font-size:2.6rem;line-height:1.5;text-align:center}.bl_demo_spTxt{color:rgba(0,0,0,.6);font-size:1.8rem;line-height:1.6;margin-top:1.5em}@media screen and (max-width:768px){.bl_demo_bg,.bl_demo_btn,.bl_demo_desc,.bl_demo_mock,.bl_demo_screen{display:none}}