body {
    width: 100%;
    height: 100%;
    font-size: 15px;
    color: #333;
    background-color: #f6f6f6;
    font-family: 'Microsoft Yahei', sans-serif;
}

body,
html,
div,
h4,
strong,
span,
h2 {
    margin: 0;
    padding: 0;
}

#app {
    min-height: 100vh;
    max-width: 750px;
    margin: 0 auto;
    background-color: #fff;
}

.mt10 {
    margin-top: 10px;
}

.w50 {
    width: 50%;
}