@media screen and (min-width: 300px) and (max-width:750px) {
    html {
        font-size: calc(100vw / 7.5)
    }
}

@media screen and (max-width:300px) {
    html {
        font-size: 40px;
    }
}

.app {
    max-width: 750px;
    margin: 0 auto;
    min-height: 100%;
    height: auto;
    background: url('../images/bg.jpg') center no-repeat;
    background-size: cover;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-bottom: 2rem;
}

h1 {
    margin-top: 1.3rem;
    width: 4.08rem;
    height: 2.06rem;
}

h1>img {
    width: 100%;
    height: 100%;
}

.a_link {
    width: 5.69rem;
    margin-top: 1.1rem;
    margin-bottom: 0.6rem;
}

.a_link>li {
    width: 100%;
    height: 0.55rem;
    background: url('../images/btn.png') center no-repeat;
    background-size: 100% 100%;
    margin-bottom: 0.3rem;
}

.a_link>li>a {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    color: green;
}

p {
    line-height: 0.5rem;
    font-size: 0.28rem;
    color: white;
    font-weight: 500;
}