\documentclass[a4paper]{jreport} \usepackage{titlesec} \usepackage{picture} \usepackage[usenames]{color} %\usepackage[usenames,divpsnames]{xcolor} % colors \definecolor{teal}{RGB}{0,128,128} \definecolor{powderblue}{RGB}{176,224,230} \definecolor{darkslateblue}{RGB}{72,61,139} \definecolor{darkslategray}{RGB}{47,79,79} \definecolor{lightcyan}{RGB}{224,255,255} % chapter \titleformat{\chapter}[bloc
![LaTeXでセクションとかのデザインを変える - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/e64e960a8e8804fe9bb062bd3a72d493a5417ba9/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9TGFUZVglRTMlODElQTclRTMlODIlQkIlRTMlODIlQUYlRTMlODIlQjclRTMlODMlQTclRTMlODMlQjMlRTMlODElQTglRTMlODElOEIlRTMlODElQUUlRTMlODMlODclRTMlODIlQjYlRTMlODIlQTQlRTMlODMlQjMlRTMlODIlOTIlRTUlQTQlODklRTMlODElODglRTMlODIlOEImdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT01NiZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZzPTczMzM4OTJhYTg3YjAwZDA5OTAzMTIxNDM5MGVhYmEy%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDBrcnR4JnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz1lNGIwODk4ODE4NzE1OGI5Y2M2OWIwNDdlYmEzNGEwNw%26blend-x%3D142%26blend-y%3D486%26blend-mode%3Dnormal%26s%3Dbd86c080c6cc9123ecff3ba00491e8a9)