body {
    text-align: center;
    width: 550px;
}

.mainDivBth, #errorDivBackBth, #errorDivSendBth, #sendDivBackBth, .linkBth {
    width: calc(100% - 30px);
    margin: 0 15px;
    color: white;
    background: linear-gradient(#01a9e1, #5bc4bc);
    border: 0;
    border-radius: 20px;
    padding: 5px;
    font-weight: bold;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    box-sizing: border-box;
}

.linkBth {
    display: inline-block;
}

.separator {
    background-color: black;
    display: block;
    text-align: center;
    text-decoration: none;
    box-sizing: border-box;
}

#current-url {
    word-break: break-all;
    width: 90%;
    margin-left: auto;
    margin-right: auto;
}