style.css

html {
    overflow-y: auto;
}

header {
    background-color: rgba(0,0,0,0.8);
    padding: 10px;
    color: white;
}

#url-label {
    width: 40%;
}

#url-input {
    width: 100%;
    display: inline;
}

#url-error-box-container {
    position: relative;
    width: 0;
    height: 0;
}

#url-error-box {
    display: none;
    position: absolute;
    left: 0;
    top: 0;
    padding: 10px;
    background-color: rgba(255,0,0,0.8);
    z-index: 100;
    white-space: nowrap;
    border-radius: 10px;
}

.client-inner-container {
    background-color: #eeeeee;
    padding: 10px;
    margin: 10px;
    box-shadow: 0 0 20px -5px black;
}

.client-status-bar {
    float: right;
}

.client-request-input {
    min-width: 100%;
    max-width: 100%;
    display: block;
    margin-bottom: 2px;
}

.response-log {
    -webkit-user-select: text;
    margin-top: 0;
    min-height: 100px;
    background-color: white;
    box-shadow: 0 0 10px -3px black inset;
    overflow-y: auto;
    max-height: 400px;
}

.server-color {
    color: #0000D8;
}

.client-color {
    color: #009600;
}

.status-color {
    color: #DD7300;
}