.gototop {
    display: none;
    -webkit-animation: hide 350ms ease-out forwards 1;
    animation: hide 350ms ease-out forwards 1;
    /*padding: 16px 32px;*/ /*2017-03-14編輯*/
    border: 0;
    text-align: center;
    background-color: transparent; /*2017-03-14編輯*/
    /*color: #494A5F;*/
    position: fixed;
    bottom: 16px;
    right: 16px;
    -webkit-transition: background-color 100ms ease-in-out;
    transition: background-color 100ms ease-in-out;
}

.gototop > span {
    display: inline-block;
    -webkit-transition: transform 100ms 100ms ease-in-out;
    transition: transform 100ms 100ms ease-in-out;
}

.gototop:hover,
.gototop:focus {
    /*background-color:#D5D6E2;*/ /*2017-03-14編輯*/
}

.gototop:hover > span,
.gototop:focus > span {
    -webkit-transform: translateY(-2px);
    transform: translateY(-2px);
}

.isvisible {
    -webkit-animation: show 1s ease-out forwards 1;
    animation: show 1s ease-out forwards 1;
}

@-webkit-keyframes hide {
    0% {
        opacity: 1;
        -webkit-transform: translateY(0);
    }
    25% {
        opacity: .5;
        -webkit-transform: rotate(-3deg) translateY(-40px);
    }
    75% {
        -webkit-transform: rotate(3deg);
    }
    100% {
        opacity: 0;
        -webkit-transform: translateY(100px);
    }
}

@keyframes hide {
    0% {
        opacity: 1;
        transform: translateY(0);
    }
    25% {
        opacity: .5;
        transform: rotate(-3deg) translateY(-40px);
    }
    75% {
        transform: rotate(3deg);
    }
    100% {
        opacity: 0;
        transform: translateY(100px);
    }
}

@-webkit-keyframes show {
    0% {
        -webkit-transform: rotate(0deg);
    }
    25% {
        opacity: .5;
        -webkit-transform: rotate(-3deg) translateY(-40px);
    }
    75% {
        -webkit-transform: rotate(3deg);
    }
    100% {
        opacity: 1;
        -webkit-transform: rotate(0deg);
    }
}

@keyframes show {
    0% {
        transform: rotate(0deg);
    }
    25% {
        opacity: .5;
        transform: rotate(-3deg) translateY(-40px);
    }
    75% {
        transform: rotate(3deg);
    }
    100% {
        opacity: 1;
        transform: rotate(0deg);
    }
}