project-codepen/src/pages/FormUpload.css

.buttons {
    width: 180px;
    height: 40px;
    text-decoration: none;
    padding-top: 9px;
    color: #c9b6cf;
    text-align: center;
    line-height: 20px;
    display: block;
    margin: 200px auto 15px;
    font: normal 17px arial;
    cursor: pointer;
}
  
.buttons:not(.active) {
    box-shadow: inset 0 1px 1px rgba(111, 55, 125, 0.8), inset 0 -1px 0px rgba(63, 59, 113, 0.2), 0 9px 16px 0 rgba(0, 0, 0, 0.3), 0 4px 3px 0 rgba(0, 0, 0, 0.3), 0 0 0 1px #150a1e;
    background-image: linear-gradient(#3b2751, #271739);
    text-shadow: 0 0 21px rgba(223, 206, 228, 0.5), 0 -1px 0 #311d47;
}
  
.buttons:not(.active):hover,
.buttons:not(.active):focus {
    transition: color 200ms linear, text-shadow 500ms linear;
    color: #fff;
    text-shadow: 0 0 21px rgba(223, 206, 228, 0.5), 0 0 10px rgba(223, 206, 228, 0.4), 0 0 2px #2a153c;
}

.buttons:not(:hover) {
      transition: 0.6s;
}

.back a {
    text-decoration: none;
}

.back {
    display: block;
    width: 100px;
    height: 20px;
    text-decoration: none;
    color: #c9b6cf;
    text-align: center;
    margin: auto;
    cursor: pointer;
}