html {
    margin: 0;
    padding: 0;
}
body {
    margin: 10px;
    padding: 0;
}
.container {
    margin: 15px auto;
    padding: 15px;
    min-height: 400px;
    background-color: #aca8a8;
    border: 1px solid rebeccapurple;
    border-radius: 15px;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: space-evenly;
    align-items: stretch;
}

.menu {
    margin-right: 10px;
    padding: 11px;
    width: 250px;
    background-color: #5ccb8c;
    border: 2px solid rebeccapurple;
    border-radius: 15px;

    /*便于计算*/
    background-origin: border-box;
}

iframe {
    overflow-clip-margin: content-box !important;
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    border-width: 0px;
}

object {
    overflow-clip-margin: content-box !important;
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    border-width: 0px;
}

.context {
    width: calc(100% - 200px);
    padding: 10px;
    background-color: #7b96cf;
    border: 2px solid rebeccapurple;
    border-radius: 15px;
    margin-left: auto;
    text-align: center;
    font-size: 50px;

    /*便于计算*/
    background-origin: border-box;

    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content:flex-start;
    align-items: center;
}