body {
    display: block;
    margin: 0;
}

.header{
    height: 50px;
    width: 100%;
    background: #b4b4b4;
}

#output{
    height: 400px;
    width: 60%;
    overflow: auto;
    margin: 30px auto;
    box-shadow: 0 0 10px 5px #aaa;
    background-image: linear-gradient(to right, #37b9e9 , #89bfbc);
}

.operate{
    margin: 20px 0;
}

.content{
    width: 60%;
    margin: 0 auto;
}

.content input{
    width: 300px;
    height: 30px;
    border-radius: 5px;
}

#message{
    width: 100%;
    height: 200px;
}

.content button{
    height: 34px;
    width: 100px;
    border-radius: 6px;
    background: #dc6a6a;
    color: aliceblue;
    font-family: cursive;
    font-size: medium
}

.msg{
    height: 30px;
    margin: 0 10px;
    border-bottom: 1px #f4c6ce dashed;
}

.sendMsg{
    font-family: cursive;
}

.recvMsg{
    color: #f01000;
    font-family: cursive;
}