Js Event Task Styles

body
{
    font-family:Gill Sans MT;
    padding:10px;
}
input.add
{
    float:right;
}
input.fieldname
{
    float:left;
    clear:left;
    display:block;
    margin:5px;
}
input.remove
{
    float:left;
    display:block;
    margin:5px;
}
#yourform label
{
    display:block;
    margin:5px;
    border-top: 1px solid lightgrey;
}
#yourform input, #yourform textarea
{
    float:left;
    display:block;
    margin:5px;
}
/*  */
.field-buttons{
    float: right;
    width: 329px;
}
.field-buttons input{
    padding: 5px;
}
.fieldwrapper{
    display: flex;
    padding: 10px;
}
.field-subject{
    margin-right: 10%;
    display: flex;
    height: 30px;
}
.field-buttons{
    padding-top: 20px;
}
#add{
    border-radius: inherit;
}
#preview{
    border-radius: 0px 5px 5px 0px;
}
#empty{
    border-radius: 5px 0px 0px 5px;
}
#yourform{
    display: contents;
}
.table-first-column{
    padding-right: 10%;
}
legend{
    float: none;
    font-size: 14px;
    font-weight: bold;
    padding-top: 6%;
}
#hovertext {
    opacity: 0;
}
#btn-remove:hover~#hovertext{
    opacity: 1;
    -webkit-animation: fadein 2s; /* Safari, Chrome and Opera > 12.1 */
       -moz-animation: fadein 2s; /* Firefox < 16 */
        -ms-animation: fadein 2s; /* Internet Explorer */
         -o-animation: fadein 2s; /* Opera < 12.1 */
            animation: fadein 2s;
}
.span-field{
    width: -webkit-fill-available
}
.span-btn{
    margin-top: 20px;
    margin-left: 24px;
}
.span-number{
    padding-top: 25px;
    font-size: 21px;
    font-family: sans-serif;
    padding-right: 40px;
}
@keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Firefox < 16 */
@-moz-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Safari, Chrome and Opera > 12.1 */
@-webkit-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Internet Explorer */
@-ms-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Opera < 12.1 */
@-o-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}