h5.text-align-center.call_for_paper {
    margin: 20px 0px;
}

.btn-square-slant {
  display: inline-block;
  position: relative;
  padding: 0.5em 1.4em;
  text-decoration: none;
  background: #668ad8;/*ボタン色*/
  color: #FFF;
  border-bottom: solid 5px #36528c;/*ボタン色より暗めに*/
  border-right: solid 5px #5375bd;/*ボタン色より暗めに*/
}

.btn-square-slant:before {  
  content: " ";
  position: absolute;
  bottom: -5px;
  left: -1px;
  width: 0;
  height: 0;
  border-width: 0 6px 6px 0px;
  border-style: solid;
  border-color: transparent;
  border-bottom-color: #FFF;
}

.btn-square-slant:after {  
  content: " ";
  position: absolute;
  top: -1px;
  right: -5px;
  width: 0;
  height: 0;
  border-width: 0px 6px 6px 0px;
  border-style: solid;
  border-color: #FFF;
  border-bottom-color: transparent;
}

.btn-square-slant:active {
  /*ボタンを押したとき*/
  border:none;
  -webkit-transform: translate(6px,6px);
  transform: translate(6px,6px);
}

.btn-square-slant:active:after, .btn-square-slant:active:before {
  content: none;/*ボタンを押すと線が消える*/
}