html, body {
    margin: 0;
    padding: 0;
}

:root {
    --search-border: #bbb;
    --search-focus-border: #3a71ca;
}

.container {
    width: 80%;
    margin: 0 auto;
}

.sr-only {
    position: absolute;
    left: -10000px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.search-bar {
    padding: 10px;
    border: 1.5px solid var(--search-border);
    border-radius: 5px;
    transition: width 0.5s;
    margin-top: 30px;
}

.search-bar:focus {
    width: 100%;
    border:  2px solid var(--search-focus-border);
    outline: none;
}

.search-bar::placeholder {
    opacity: 1;
}

.search-bar:focus::placeholder {
    opacity: 0;
}

.container:not(:focus-within) .search-bar {
    width: 33%;
}