body, html {
height: 100%;
margin: 0;
}
body {
display: flex;
flex-direction: column;
}
#main {
display: flex;
flex-direction: row;
flex: 1;
}
#main>div {
display: flex;
flex-direction: column;
width: 100%;
height: 100%;
}
section {
margin: 5px;
}
textarea {
resize: none;
flex: 1;
width: 100%;
box-sizing: border-box;
font-family: 'Microsoft Yahei';
font-size: 16px;
}