/* ボタン */
.square_btn{
    display: inline-block;
    padding: 0.5em 1em;
    text-decoration: none;
    background: #668ad8;/*ボタン色*/
    color: #FFF;
    border-bottom: solid 4px #627295;
    border-radius: 3px;
}
.square_btn:active {/*ボタンを押したとき*/
    -ms-transform: translateY(4px);
    -webkit-transform: translateY(4px);
    transform: translateY(4px);/*下に動く*/
    border-bottom: none;/*線を消す*/
}

/*  Twitter */
.fl_tw {
  text-decoration: none;
  display: inline-block;
  text-align: center;
  color: #1da1f3;
  font-size: 17px;
  /*
  font-size: 25px;
  */
  text-decoration: none;
  }

.fl_tw:hover {
  color:#88daff;
  transition: .5s;
}

.fl_tw .twicon{
  border-radius: 5px;
/* 
  border-radius: 10px;
*/
  position: relative;
  display: inline-block;
  width: 25px;
  height: 25px;
  font-size: 17px;
  line-height: 25px;
/* 
  width: 50px;
  height: 50px;
  font-size: 35px;
  line-height: 50px;
*/
  vertical-align: middle;
  color: #FFF;
  background: #1da1f3;
}

.fl_tw .twicon .fa {
  line-height: 50px;
}