.tit_style11 {
 text-align: center;
 font-size: 28px;
 font-size: 2.8rem;
 font-weight: bold;
 min-height: calc( 1.7em * 2 );
 line-height: 1.7;
 position: relative;
 display: flex;
 justify-content: center;
 align-items: center;
 padding: 20px 50px;
}

.tit_style11:before,.tit_style11:after {
 content: '';
 position: absolute;
 border-style: solid;
 border-width: 50px 50px 0 0;
 border-color: var(--main-color) transparent transparent transparent;
 }

.tit_style11:before {
 top:0;
 left: 0;
 }

.tit_style11:after {
 bottom:0;
 right: 0;
 transform: rotate(180deg);
 }

@media  (max-width : 810px){
.tit_style11 {
 font-size: 25px;
 font-size: 2.5rem;
 padding: 20px 30px;
}
 
.tit_style11:before,.tit_style11:after {
 content: '';
 position: absolute;
 border-style: solid;
 border-width: 30px 30px 0 0;
 border-color: var(--main-color) transparent transparent transparent;
}
 
}