<a class="bt more-bt" href="javascript:void(0)">
        <span class="fl"></span><span class="sfl"></span><span class="cross"></span><i></i>
        <p>add</p>
    </a>

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

html {
  height: 100%;
  width: 100%;
}

p {
  margin: 0;
}

body {
  height: 100%;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.bt {
    width: 100px;
    cursor: pointer;
    position: relative;
    font-family: "Roboto";
    text-transform: uppercase;
    color: #503af6;
    letter-spacing: 0.5px;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    outline: none;
    text-decoration: none;
    text-align: center;
  
}

.more-bt {
    border-right: 2px solid #503af6;
    border-bottom: 2px solid #503af6;
    padding: 17px 29px 15px 31px;
    border-color: #503af6;
}

.more-bt p {
  font-size: 14px;
}

#wrapper.smooth section.smoothy.show {
    visibility: visible;
}

.more-bt:before {
    left: 0;
    bottom: 0;
    height: -webkit-calc(100% - 17px);
    height: calc(100% - 17px);
    width: 2px;
}

.more-bt:after, .more-bt:before {
    content: " ";
    display: block;
    background: #503af6;
    position: absolute;
    -webkit-transition: .5s;
    transition: .5s;
    z-index: 10;
}

.more-bt:after {
    top: 0;
    right: 0;
    width: -webkit-calc(100% - 17px);
    width: calc(100% - 17px);
    height: 2px;
}

.more-bt:after, .more-bt:before {
    content: " ";
    display: block;
    background: #503af6;
    position: absolute;
    -webkit-transition: .5s;
    transition: .5s;
    z-index: 10;
}

::selection {
    background: #503af6;
    color: #FFFFFF;
    text-shadow: none;
}

.more-bt:before {
    left: 0;
    bottom: 0;
    height: -webkit-calc(100% - 17px);
    height: calc(100% - 17px);
    width: 2px;
}

.more-bt:after, .more-bt:before {
    content: " ";
    display: block;
    background: #503af6;
    position: absolute;
    -webkit-transition: .5s;
    transition: .5s;
    z-index: 10;
}

.more-bt .fl, .more-bt .sfl {
    position: absolute;
    right: 0;
    height: 100%;
    width: 0;
    z-index: 2;
    background: #503af6;
    top: 0;
    -webkit-transition: .5s;
    transition: .5s;
    -webkit-transition-delay: .1s;
    transition-delay: .1s;
}

.more-bt .fl, .more-bt .sfl {
    position: absolute;
    right: 0;
    height: 100%;
    width: 0;
    z-index: 2;
    background: #503af6;
    top: 0;
    -webkit-transition: .5s;
    transition: .5s;
    -webkit-transition-delay: .1s;
    transition-delay: .1s;
}

.more-bt .sfl {
    z-index: 1;
    background: #4431D1;
    -webkit-transition: .7s;
    transition: .7s;
}

.more-bt .cross {
    position: absolute;
    z-index: 15;
    width: 18px;
    height: 18px;
    top: -webkit-calc(50% - 8px);
    top: calc(50% - 8px);
    left: -webkit-calc(50% - 8px);
    left: calc(50% - 8px);
}

#wrapper.smooth section.smoothy {
    visibility: hidden;
}

.more-bt .cross:before {
    width: 100%;
    height: 2px;
    top: 8px;
    left: 0px;
    -webkit-transform: translateX(50px) scaleX(0);
    -ms-transform: translateX(50px) scaleX(0);
    transform: translateX(50px) scaleX(0);
}

.more-bt .cross:before, .more-bt .cross:after {
    content: " ";
    background: #fff;
    display: block;
    position: absolute;
    opacity: 0;
    -webkit-transition-duration: .3s;
    transition-duration: .3s;
    -webkit-transition-delay: 0s;
    transition-delay: 0s;
    -webkit-transition-timing-function: cubic-bezier(0.86, 0, 0.07, 1);
    transition-timing-function: cubic-bezier(0.86, 0, 0.07, 1);
}

.more-bt .cross:after {
    width: 2px;
    height: 100%;
    left: 8px;
    top: 0;
    -webkit-transform: translateY(20px) scaleY(0);
    -ms-transform: translateY(20px) scaleY(0);
    transform: translateY(20px) scaleY(0);
    -webkit-transition-duration: .4s;
    transition-duration: .4s;
}

.more-bt .cross:before, .more-bt .cross:after {
    content: " ";
    background: #fff;
    display: block;
    position: absolute;
    opacity: 0;
    -webkit-transition-duration: .3s;
    transition-duration: .3s;
    -webkit-transition-delay: 0s;
    transition-delay: 0s;
    -webkit-transition-timing-function: cubic-bezier(0.86, 0, 0.07, 1);
    transition-timing-function: cubic-bezier(0.86, 0, 0.07, 1);
}

.more-bt i {
    position: absolute;
    display: block;
    top: 1px;
    left: 1px;
    -webkit-transition: .5s;
    transition: .5s;
    z-index: 10;
}

.more-bt i:before {
    -webkit-transform: rotate(90deg);
    -ms-transform: rotate(90deg);
    transform: rotate(90deg);
}

.more-bt i:after, .more-bt i:before {
    content: " ";
    display: block;
    width: 2px;
    height: 20px;
    background: #503af6;
    position: absolute;
    margin: -10px -1px;
    left: 50%;
    top: 50%;
    transition: 0.3s;
}

.more-bt:hover i:after {
    content: " ";
    display: block;
    width: 2px;
    height: 20px;
    background: #503af6;
    position: absolute;
    margin: 0px -1px;
    left: 50%;
    top: 50%;
}

.more-bt:hover i:before {
    content: " ";
    display: block;
    width: 2px;
    height: 20px;
    background: #503af6;
    position: absolute;
    margin: -10px 0px -10px 8px;
    left: 50%;
    top: 50%;
}

.more-bt p {
    -webkit-transition: .5s;
    transition: .5s;
    position: relative;
    z-index: 1;
}

.more-bt:hover:before, .more-bt:before {
    height: 100%;
}

.more-bt:before {
    left: 0;
    bottom: 0;
    height: -webkit-calc(100% - 17px);
    height: calc(100% - 17px);
    width: 2px;
}

.more-bt:hover .fl, .more-bt .fl {
    -webkit-transition: .7s;
    transition: .7s;
}

.more-bt:hover .fl, .more-bt:hover .sfl, .more-bt .fl, .more-bt .sfl {
    -webkit-transition-delay: 0s;
    transition-delay: 0s;
    width: 100%;
}

.more-bt .fl, .more-bt .sfl {
    position: absolute;
    right: 0;
    height: 100%;
    width: 0;
    z-index: 2;
    background: #503af6;
    top: 0;
    -webkit-transition: .5s;
    transition: .5s;
    -webkit-transition-delay: .1s;
    transition-delay: .1s;
}

.more-bt:hover .sfl, .more-bt. .sfl {
    -webkit-transition: .5s;
    transition: .5s;
}

.more-bt:hover .fl, .more-bt:hover .sfl, .more-bt.hvd .fl, .more-bt.hvd .sfl {
    -webkit-transition-delay: 0s;
    transition-delay: 0s;
    width: 100%;
}

.more-bt .sfl {
    z-index: 1;
    background: #4431D1;
    -webkit-transition: .7s;
    transition: .7s;
}

.more-bt .cross {
    position: absolute;
    z-index: 15;
    width: 18px;
    height: 18px;
    top: -webkit-calc(50% - 8px);
    top: calc(50% - 8px);
    left: -webkit-calc(50% - 8px);
    left: calc(50% - 8px);
}

.more-bt:hover .cross:before, .more-bt .cross:before {
    -webkit-transition-duration: .5s;
    transition-duration: .5s;
}

.more-bt:hover .cross:after, .more-bt:hover .cross:before, .more-bt .cross:after, .more-bt .cross:before {
    -webkit-transform: none;
    -ms-transform: none;
    transform: none;
    opacity: 1;
    -webkit-transition-delay: .2s;
    transition-delay: .2s;
}

.more-bt .cross:after {
    width: 2px;
    height: 100%;
    left: 8px;
    top: 0;
    -webkit-transform: translateY(20px) scaleY(0);
    -ms-transform: translateY(20px) scaleY(0);
    transform: translateY(20px) scaleY(0);
    -webkit-transition-duration: .4s;
    transition-duration: .4s;
}

.more-bt .cross:before, .more-bt .cross:after {
    content: " ";
    background: #fff;
    display: block;
    position: absolute;
    opacity: 0;
    -webkit-transition-duration: .3s;
    transition-duration: .3s;
    -webkit-transition-delay: 0s;
    transition-delay: 0s;
    -webkit-transition-timing-function: cubic-bezier(0.86, 0, 0.07, 1);
    transition-timing-function: cubic-bezier(0.86, 0, 0.07, 1);
}

.more-bt:hover .cross:after, .more-bt:hover .cross:before, .more-bt.hvd .cross:after, .more-bt.hvd .cross:before {
    -webkit-transform: none;
    -ms-transform: none;
    transform: none;
    opacity: 1;
    -webkit-transition-delay: .2s;
    transition-delay: .2s;
}

.more-bt:hover .cross:after, .more-bt.hvd .cross:after {
    -webkit-transition-duration: .6s;
    transition-duration: .6s;
}