Remove inline css from theme

I’m trying to customize the Jumpstart theme but I can’t override the css styles below. It is overriding my custom css and child theme css. I want to remove this whole section but I can’t find where it’s being added in.

            .header{
                background: transparent;
                border-bottom: none;
            }

            #mainmenu > li > a,.navbar .nav.cart > li > a > i, .nav-search > li > a > i{
                color: #fff;
                background: transparent;
            }

            .page-heading{
                background: transparent;
                padding: 150px 0;
            }

            .header-wrap{
                background: url(https://130.211.193.64/wp-content/themes/jumpstart/assets/images/blog-header-bg.jpg) no-repeat center center;
                background-size: cover;
                position: relative;
            }

            .header-wrap .overlay {
                position: absolute;
                background: rgba(0, 0, 0, 0.1);
                left: 0;
                right: 0;
                top: 0;
                bottom: 0;
            }

            .icon-sap:before, .icon-sap:after{
                border-color: #fff;
            }

            .icon-sap > i{
                color: #fff;
            }

            .page-title .title, #breadcrumbs a, #breadcrumbs span{
                color: #fff;
                background: transparent;
            }