@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');

:root {
    --element-fill: #fff94c;
    --search-radius: 15px;
}

* {
    box-sizing: border-box;
}

body {
    background-image: linear-gradient(90deg, #7d5fff,#7158e2);
    font-family: 'Roboto', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    margin:0;
}

.search {
    position: relative;
    height: 50px;
}

.search .input {
    background-color: var(--element-fill);
    border:0;
    font-size: 18px;
    padding: 15px;
    height: 50px;
    width: 50px;
    transition: width 0.3s ease;
    border-radius: var(--search-radius);
}
.search.active .input {
    width: 200px;
    border-radius: var(--search-radius);
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
}

.btn {
    background-color: var(--element-fill);
    border: 0;
    cursor: pointer;
    font-size: 24px;
    position: absolute;
    top: 0;
    left: 0;
    height: 50px;
    width: 50px;
    transition: transform 0.3s ease, border-radius 0.6s linear;
    border-radius: var(--search-radius);
    border-top-right-radius: 0;
    border-bottom-left-radius: 0;
}
.search.active .btn {
    transform: translateX(198px);
    border-top-left-radius: 0;
}

.btn:focus, .input:focus {
    outline: none;
}