Colorfull-Checkbox.css

@import url('https://fonts.googleapis.com/css?family=Poppins');

#Colorful-Checkbox{
    margin: 0;
    padding: 0;
    height: 100vh;
    background: #222;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Poppins', sans-serif;
    position: relative;
}

 .container{
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    top: 250px;
 }

 .container div{
    margin: 10px;
 }

 .container div label{
    cursor: pointer;
 }

 .container div label input[type="checkbox"]{
    display: none;
 }

 .container div label span{
    position: relative;
    display: inline-block;
    background: #424242;
    padding: 15px 30px;
    color: rgb(122, 122, 122);
    text-shadow: 0 1px 4px rgba(0,0,0,0.5);
    border-radius: 30px;
    font-size: 20px;
    transition: 0.5s;
    user-select: none;
    overflow: hidden;
 }

 .container div label span::before{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: rgba(255,255,255,0.1);
 }

 .container div:nth-child(6n + 1) label input[type="checkbox"]:checked ~ span{
    background: #e91e63;
    color: #fff;
    box-shadow: 0 2px 20px #e91e63;
 }

 .container div:nth-child(6n + 2) label input[type="checkbox"]:checked ~ span{
    background: rgb(10, 206, 10);
    color: #fff;
    box-shadow: 0 2px 20px rgb(10, 206, 10);
 }


 .container div:nth-child(6n + 3) label input[type="checkbox"]:checked ~ span{
    background: #df01d7;
    color: #fff;
    box-shadow: 0 2px 20px #df01d7;
 }

 .container div:nth-child(6n + 4) label input[type="checkbox"]:checked ~ span{
    background: #2e2efe;
    color: #fff;
    box-shadow: 0 2px 20px #2e2efe;
 }

 .container div:nth-child(6n + 5) label input[type="checkbox"]:checked ~ span{
    background: #cebb0f;
    color: #fff;
    box-shadow: 0 2px 20px #cebb0f;
 }

 .container div:nth-child(6n + 6) label input[type="checkbox"]:checked ~ span{
    background: #00c3ff;
    color: #fff;
    box-shadow: 0 2px 20px #00c3ff;
 }