.switch-theme {

    background: rgba(50, 50, 50, 0.5);
}

.switch {

    position: relative;
    display: inline-block;
    margin: 5px 0;
    width: 35px;
    height: 15px;
  }

.switch input {

    opacity: 0;
    width: 0;
    height: 0;
}
  
.slider {

    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
}
  
.slider:before {

    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: -2px;
    bottom: -2px;
    background-color: #2ecc71;
    transition: .4s;
}
  
input:checked + .slider {

    background-color: rgba(20, 214, 101, 0.466);
}
  
input:checked + .slider:before {

    transform: translateX(21px);
}

.slider.round {

    border-radius: 34px;
}
  
.slider.round:before {
    border-radius: 50%;
}