input[type="text"] {
  font-size: 20px;
}

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

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

/* clear fix */
.grid:after {
  content: '';
  display: block;
  clear: both;
}

.button-group button {
    background-color: black;
    border: 1px;
    color: white;
    padding: 3px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    cursor: pointer;
    width:26px;
    border-radius: 10px;
}

.button-group.button:active,
.button.is-checked {
  background-color: darkblue;
}

.button-group{
  margin-top: -1rem;
}

/*Popup*/

.overlay {
  position: fixed;
  top: 100px;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.7);
  transition: opacity 500ms;
  visibility: hidden;
  opacity: 0;
  z-index: 201;
}
.overlay:target {
  visibility: visible;
  opacity: 1;
}

.popup {
  margin: 70px auto;
  padding: 20px;
  background: #fff;
  border-radius: 5px;
  width: 50%;
  position: relative;
  transition: all 5s ease-in-out;
}

.popup h2 {
  margin-top: 0;
  color: #333;
  font-family: Tahoma, Arial, sans-serif;
}
.popup .close {
  position: absolute;
  top: 20px;
  right: 30px;
  transition: all 200ms;
  font-size: 30px;
  font-weight: bold;
  text-decoration: none;
  color: #333;
  margin: -20px;
}
.popup .close:hover {
  color: #06D85F;
}
.popup .content {
  max-height: 50vh;
  overflow: auto;
}
i {
    width: 20px;
}
@media screen and (max-width: 700px){ 
  .popup{
    width: 70%;
  }
}