/*当屏幕小于或等于600px时*/
@media screen and (max-width: 600px) {
    .aboutUsTxtDIV {
        position: absolute;top: 70px;
        background: rgba(238, 238, 238, 0.9);
        margin: 15px;
        padding: 3rem;
        overflow-y: auto;
        min-height: 300px;
    }

    .aboutUsTxtTitle {
        text-align: center;
        font-size: 1.5rem;
        padding-bottom: 1rem;
    }

    .aboutUsTxt {
        text-align: left;
        font-size: 1rem;
        font-weight: 200;
    }
}

/*当屏幕大于或等于601px时*/
@media screen and (min-width: 601px) {
    .centerDIV {
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .aboutUsTxtDIV {
        position: absolute;top: 80px;
        background: rgba(238, 238, 238, 0.9);
        width: 90%;
        margin: auto;
        margin-top: 15px;
        margin-bottom: 15px;
        padding: 3rem;
        overflow-y: auto;
        min-height: 300px;
    }

    .aboutUsTxtTitle {
        text-align: center;
        font-size: 1.5rem;
        padding-bottom: 1rem;
    }

    .aboutUsTxt {
        text-align: left;
        font-size: 1rem;
        font-weight: 200;
    }
}

/*当屏幕大于或等于801px时*/
@media screen and (min-width: 801px) {

    .centerDIV {
        display: flex;justify-content: center;align-items: center;
    }

    .aboutUsTxtDIV {
        position: absolute;top: 70px;
        background: rgba(238, 238, 238, 0.9);
        width: 80%;
        margin: auto;
        margin-top: 30px;
        padding: 3rem;
        overflow-y: auto;
        min-height: 300px;
    }

    .aboutUsTxtTitle {
        text-align: center;
        font-size: 2rem;
        padding-bottom: 1rem;
    }

    .aboutUsTxt {
        text-align: left;
        font-size: 1.5rem;
        font-weight: 200;
    }
}