* {
    margin: 0;
    padding: 0;
    border: none;
    box-sizing: border-box;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
ul, ol {
    list-style-type: none;
}
input{
    background: none;
    border: none;
}
input:focus {
    outline: none;
}
html, body {
    max-width: 640px;
    width: 100%;
    height: 100%;
    margin: 0 auto;
    font-family: "Microsoft YaHei";
}
em {
    font-style: normal;
    font-weight: normal;
}


/*-----flex-----*/
.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}
.flex-row {
     display: flex;
     flex-direction: row;
     align-items: center;
     justify-content: space-between;
 }
.flex-row-1{
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    justify-content: flex-start;
}
.flex-row-2{
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
}
.flex-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
}
.flex-column-1 {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
}
/*-----flex-----*/