style.css

body {
    font-family: "Open Sans", sans-serif;
    font-size: 14px;
    margin: 0;
    min-height: 180px;
    padding: 0;
    width: 480px;
}

.flex-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 22px;
}

.flex {
    opacity: 1;
    transition: opacity 0.2s ease-in-out;
    margin: 0.5em;
}

.flex:hover {
    opacity: 0.4;
}

.btn {
    border-radius: 24px!important;
    width: 18em;
}

img {
    padding: 2px;
    width: 1.5em;
    height: 1.5em;
}

.flex a p {
    visibility: hidden;
}

.flex:hover {
    cursor: pointer;
}

.flex:hover p {
    visibility: visible;
}

a:link,
a:visited {
    color: #000000;
    outline: 0;
    text-decoration: none;
}

.input-group-text {
    display: block !important;
    width: 4em;
}

p {
    text-align: center;
}

.app-title {
    margin-left: 1em;
    margin-top: 0.2em;
    margin-bottom: 0.2em;
    font-weight: bold;
}