.button-group{width: 100%; height: auto; text-align: center; margin-bottom: 20px;}
.filter-button {
    display: inline-block;
    border: none;
    cursor: pointer;
    font-weight: normal;
    padding: 10px 20px;
    margin-left: 5px; margin-right: 5px;
}
.filter-button:hover {}  .filter-button:active, .filter-button.is-checked {}  /* ---- button-group ---- */  .button-group:after {content: '';display: block;clear: both;}  .button-group .filter-button {display: inline-block;outline: none;}  /* ---- isotope ---- */  .filter-project-grid {width: 100%;}  /* clear fix */  .filter-project-grid:after {content: '';display: block;clear: both;}  /* ---- .element-item ---- */  .project-item > * {}