style.css

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #15121c;
    font-size: 20px;
    padding: 0 20px 30px 0;
    line-height: 1.4;
    display: flex;
    align-items: center;
    flex-direction: column;
}
.title{
    color: black;
    background-color: #bb87fd;
    padding: 20px;
    margin: 20px;
    border-radius: 10px;
}


#container{
    height: 200px;
    display: flex;
    align-items: flex-end;
}

.bar{
    width:10px;
    background-color: #fefeff;;
    margin: 1px;
}

.swappingbars{
    background-color: red;
}


.button {
    border: none;
    display: block;
    text-align: center;
    margin: 20px;
    cursor: pointer;
    text-transform: uppercase;
    outline: none;
    overflow: hidden;
    position: relative;
    color: #ffffff;
    font-weight: 600;
    font-size: 15px;
    background-color:#2c2b3d ;
    padding: 15px 50px;
    margin: 0 auto;
}
.button span {
    margin: 20px;
    position: relative;
    z-index: 1;
}
.button:after {
    content: "";
    position: absolute;
    margin: 20px;
    left: 0;
    top: 0;
    height: 470%;
    width: 140%;
    background: #bb87fd;
    -webkit-transition: all .5s ease-in-out;
    transition: all .5s ease-in-out;
    -webkit-transform: translateX(-100%) translateY(-25%) rotate(45deg);
    transform: translateX(-100%) translateY(-25%) rotate(45deg);
}
.button:hover:after {
    margin: 20px;
    -webkit-transform: translateX(-9%) translateY(-25%) rotate(45deg);
    transform: translateX(-9%) translateY(-25%) rotate(45deg);
}