.ss-shortlink-form input { max-width: 100%; box-sizing: border-box; }
.mainus {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: white;
    padding: 30px;
    border-radius: 4px;
}
.mainus h2 {
    display: contents;
    font-size: 32px;
}
.ss-shortlink-form {
    width: 100%;
    display: flex;
    align-items: center;
    margin-top: 20px;
}
input#ss-target {
    padding: 8px;
    flex: 1 1 calc((100% - 10px) / 2);
    height: 40px;
    border-radius: 4px;
    margin: 0px;
}
button#ss-create {
    padding: 8px 12px 7px;
    width: 20%;
    margin: 0px;
    height: 40px;
    border-radius: 4px;
    margin-left: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
}
div#ss-result p {
    margin: 0px;
    font-size: 17px;
    color: red;
    font-weight: 500;
}