.element-item{
  height: 160px;
  width: 250px;
}
/*
label{
  display: inline;
}
 */
.nbox{
  padding: 4px;
  margin: 3px;
  text-align : center ;
  -webkit-border-radius : 5px;
  -moz-border-radius    : 5px;
  border-radius         : 5px;
}

.checked{
  background-color: #d1ff8c;
  color: black;
}
/*
input[type="checkbox"]{
  display: none;
}
 */
/* ---- button ---- */

.button {
    display: inline-block;
    padding: 0.5em 1.0em;
    background: #EEE;
    border: none;
    border-radius: 7px;
    background-image: linear-gradient( to bottom, hsla(0, 0%, 0%, 0), hsla(0, 0%, 0%, 0.2) );
    color: #222;
    font-family: sans-serif;
    font-size: 16px;
    text-shadow: 0 1px white;
    cursor: pointer;
}

.button:hover {
    background-color: #8CF;
    text-shadow: 0 1px hsla(0, 0%, 100%, 0.5);
    color: #222;
}

.button:active,
.button.is-checked {
    background-color: #28F;
}

.button.is-checked {
    color: white;
    text-shadow: 0 -1px hsla(0, 0%, 0%, 0.8);
}

.button:active {
    box-shadow: inset 0 1px 10px hsla(0, 0%, 0%, 0.8);
}

/* ---- button-group ---- */

.button-group:after {
    content: '';
    display: block;
    clear: both;
}

.button-group .button {
    float: left;
    border-radius: 0;
    margin-left: 0;
    margin-right: 1px;
}

.button-group .button:first-child { border-radius: 0.5em 0 0 0.5em; }
.button-group .button:last-child { border-radius: 0 0.5em 0.5em 0; }

/* ui group */

.ui-group {
    display: inline-block;
}

.ui-group h3 {
    display: inline-block;
    vertical-align: top;
    line-height: 32px;
    margin-right: 0.2em;
    font-size: 16px;
}

.ui-group .button-group {
    display: inline-block;
    margin-right: 20px;
}