:root {
    --background-color: #e7e7e7;
    --box-color: #ffffff;
    --text-color: #323232;
}

.shadow {
    box-shadow: 0px 0px 1px black;
}

* {
    margin: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    min-height: 100%;
    min-width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    flex-wrap: nowrap;
}

div#main {
    min-height: 300px;
    margin: 50px 0px 60px;
    border-radius: 3px;
    background-color: var(--box-color);
    padding: 5px 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    flex-wrap: nowrap;
}

div.item-wrapper {
    width: 85%;
    padding: 10px 0px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    flex-wrap: nowrap;
}

div.item-wrapper > * {
    margin: 10px 0px;
}

div.row-wrapper {
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    flex-wrap: nowrap;
}

@media (max-width: 899px) {
    /* 手机 */
    div#main {
        width: 90%;
    }
}
@media (min-width: 900px) {
    /* 电脑 */
    div#main {
        width: 800px;
    }
}