.hidden-view{
    display: none;
}

button.more {
width: 120px;
margin: 20px auto;
display: block;
background-color: #666;
color: #fff;
padding:10px 15px;
border: none;
outline: 0;
transition: .5s;
-erbkit-transition: .5s;
}

button.more::after {
content: "もっと見る";
transition: .2s;
-erbkit-transition: .2s;
}

button.more.on-click::after{
content: "閉じる";
}