index.css

html, body {
    margin: 0;
    padding: 0;
    background: black;
    
}
.container {
    display: flex;
    flex-direction: column;
    margin: 50px auto; /*horizontal is auto(even on both left and right) .For any element i want to be in middle i need to do margin: 0 auto; */
}
h1, h2 {
    color: white;
    margin: 0 auto;
    margin-top: 15px;
    font-size: 25px;
    
}
img {
    width: 90px;
    height: 90px;
    top: 51px;
    left: 135px;   
    margin: 0 auto;
}
#endorsement-field {
    width: 317px;
    /* height: 118px; */
    padding-bottom: 5em;
    word-wrap: break-word;
    background: #444059;
    margin: 0 auto;
    border: none;
    border-radius: 8px;
    margin-top: 15px;
    margin-bottom: 15px;
    
}
#publish-btn {
    margin: 0 auto;
    width: 317px;
    height: 61px;
    border: none;
    border-radius: 8px;
    color:  white;
    background: blue;
    font-size: 25px;
    font-weight: bold; 
}
.endorsement-msg-container {
    color: white;
    padding: 0;
    display: flex;
    flex-direction: column;
    margin: 0 auto;
    width: 310px;
    word-wrap: break-word;
    

}

p {
    margin: 0;
    padding-bottom: 30px;
}
.message-bg {
    background-color: blue;
}