/*
Theme Name: Twenty Twenty-Five Child
Template: twentytwentyfive
Version: 1.0
*/

h1,
.wp-block-heading.h1,
:where(.wp-block-post-title) {
    font-size:1.5em;
    position: relative;
    padding-left: 16px;
    padding-bottom: 8px;
    border-left: 3px solid #000000;   /* 頭の縦棒 */
    border-bottom: 1px solid #000000; /* 下の線 */
}