wewechat-plus-plus/src/js/pages/Footer/style.css

:root {
    --icon-color: #777;
    --active: #34b7f1;
    --shadow-color: #eaedea;
}

.footer {
    position: relative;
    box-shadow: inset 0 1px 0 0 var(--shadow-color);
    z-index: 9;

    & nav {
        display: flex;
        width: calc(311px - 34px);
        height: 60px;
        padding: 17px 17px 0;
        justify-content: space-between;
        box-shadow: inset -1px 0 0 0 var(--shadow-color);
    }

    & nav span {
        display: block;
        width: 24px;
        height: 27px;
        text-align: center;
        cursor: pointer;
    }

    & nav i {
        color: var(--icon-color);
        font-size: 24px;
        cursor: pointer;
    }

    & nav span:hover i {
        color: var(--active) !important;
    }
}

.footer .active {
    position: relative;

    &::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        height: 1px;
        width: 100%;
        background: var(--active);
    }

    & i {
        color: var(--active) !important;
    }
}

.right {
    position: fixed;
    bottom: 0;
    right: 0;
    width: calc(100% - 311px);
}

.contacts {
    position: relative;
    display: flex;
    height: 60px;
    align-items: center;
    justify-content: space-between;

    & input {
        height: 60px;
        width: calc(100% - 200px);
        margin-left: 32px;
        line-height: 60px;
        border: 0;
        background: 0;
        color: #808080;
        font-size: 14px;
        outline: 0;
    }

    & label {
        display: flex;
        height: 23px;
        line-height: 23px;
    }

    & .action {
        margin-right: 17px;
        display: flex;
        justify-content: space-between;
    }
}

.settings {
    display: flex;
    height: 60px;
    text-align: right;
    justify-content: flex-end;
    align-items: center;

    & .button {
        position: relative;
        margin-right: 17px;
        width: 166px;
        color: #808080;
        font-size: 14px;
        padding: 9px 8px;
        font-family: 'Roboto';
        border: 0;
        border-radius: 2px;
        background: 0;
        outline: 0;
        text-transform: uppercase;
        text-align: left;
        cursor: pointer;
        text-decoration: none;
        transform: translateY(4px);
        transition: .2s;

        &:hover {
            background: color(var(--shadow-color) alpha(-50%));
        }
    }


    & .button i {
        position: absolute;
        right: 14px;
        top: 50%;
        transform: translateY(-50%);
        font-size: 20px;
    }
}

.options {
    display: inline-block;
    margin-right: 12px;
    font-family: 'Roboto';
    font-size: 14px;
    color: rgba(0, 0, 0, .8);
    text-transform: uppercase;
}

@media (width <= 800px) {
    .footer {
        & nav {
            width: calc(280px - 34px);
            padding: 14px 17px 0;
            height: 46px;
        }

        & nav span {
            width: 20px;
            height: 20px;
        }

        & nav i {
            font-size: 16px;
        }
    }

    .right {
        width: calc(100% - 280px);
    }

    .contacts {
        height: 46px;

        & input {
            height: 46px;
            width: calc(100% - 200px);
            margin-left: 20px;
            line-height: 46px;
        }
    }

    .settings {
        height: 46px;

        & .button {
            margin-right: 8px;
            width: 130px;
            font-size: 12px;
            padding: 6px 8px;
            transform: translateY(0);
        }

        & .button i {
            font-size: 16px;
        }
    }

    .options {
        font-size: 12px;
    }
}