.button {
  display: inline-block;
  padding: 10px 18px;
  margin-bottom: 10px;
  background: transparent;
  border: none;
  border-radius: 7px;
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  text-transform: uppercase;
  font-weight: 700;
}

.button:hover {
  background-color: #fff;
  /* text-shadow: 0 1px hsla(0, 0%, 100%, 0.5); */
  color: #000;
}

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

.button.is-checked {
  color: #000;
  /* 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; } */

/* ---- isotope ---- */

.grid {
  /* border: 1px solid #333; */
}

/* clear fix */
.grid:after {
  content: '';
  display: block;
  clear: both;
}
.button-group.filters-button-group {
    text-align: center;
}
/* ---- .element-item ---- */

.element-item {
  /* position: relative;
  float: left;
  width: 100px;
  height: 100px;
  margin: 5px;
  padding: 10px;
  background: #888;
  color: #262524; */
}

.element-item > * {
  margin: 0;
  padding: 0;
}

.element-item .name {
  position: absolute;

  left: 10px;
  top: 60px;
  text-transform: none;
  letter-spacing: 0;
  font-size: 12px;
  font-weight: normal;
}

.element-item .symbol {
  position: absolute;
  left: 10px;
  top: 0px;
  font-size: 42px;
  font-weight: bold;
  color: white;
}

.element-item .number {
  position: absolute;
  right: 8px;
  top: 5px;
}

.element-item .weight {
  position: absolute;
  left: 10px;
  top: 76px;
  font-size: 12px;
}

.element-item.alkali          { background: #F00; background: hsl(   0, 100%, 50%); }
.element-item.alkaline-earth  { background: #F80; background: hsl(  36, 100%, 50%); }
.element-item.lanthanoid      { background: #FF0; background: hsl(  72, 100%, 50%); }
.element-item.actinoid        { background: #0F0; background: hsl( 108, 100%, 50%); }
/* .element-item.transition      { background: #0F8; background: hsl( 144, 100%, 50%); } */
.element-item.post-transition { background: #0FF; background: hsl( 180, 100%, 50%); }
.element-item.metalloid       { background: #08F; background: hsl( 216, 100%, 50%); }
.element-item.diatomic        { background: #00F; background: hsl( 252, 100%, 50%); }
.element-item.halogen         { background: #F0F; background: hsl( 288, 100%, 50%); }
.element-item.noble-gas       { background: #F08; background: hsl( 324, 100%, 50%); }