<h1 class="cp_h1title"><span>見出しテキスト</span></h1>
.cp_h1title{
padding: 0 0 2px 0;
background: linear-gradient(135deg, #1E88E5 0%,#039BE5 25%,#00ACC1 50%,#00897B 75%,#43A047 100%);
}
.cp_h1title span{
display: block;
padding: .3em;
background: #fafcfc;/*背景色と同じ色に*/
}