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Belajar Tailwind CSS #47 Tailwind CSS flex-basis

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Ahmad Dika Zulfahmi

17 April 2025

Apa itu flex-basis?

flex-basis digunakan untuk menentukan ukuran awal dari item di dalam sebuah container flex (yang pakai display: flex). Ini menentukan seberapa besar item itu sebelum sisa ruang dibagi-bagi.

Kelas Tailwind yang tersedia

Class

Artinya

basis-<number>

Ukuran awal item berdasarkan skala spacing (--spacing)

basis-<fraction>

Ukuran awal item berdasarkan persentase (misalnya 1/2 artinya 50%)

basis-full

Ukuran awal 100% dari lebar parent

basis-auto

Ukuran awal otomatis sesuai konten

basis-xs, sm, dst

Ukuran tetap (misalnya xs = 320px) berdasarkan skala container bawaan

basis-[value]

Custom ukuran, misalnya basis-[30vw] untuk 30% dari lebar layar

basis-(--var)

Gunakan nilai dari CSS variable

Contoh Penggunaan

1. Berdasarkan Spacing

<!DOCTYPE html>
<html lang="id">

<head>
    <meta charset="UTF-8">
    <link href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css" rel="stylesheet">
    <link rel="stylesheet" href="app.css">
</head>

<body>

    <div class="flex">
        <div class="basis-64 bg-red-200">01</div>
        <div class="basis-64 bg-blue-200">02</div>
        <div class="basis-128 bg-green-200">03</div>
    </div>

</body>

</html>

Angka seperti 64 atau 128 diambil dari skala spacing bawaan Tailwind

berikut hasilnya:

2. Berdasarkan Persentase

<!DOCTYPE html>
<html lang="id">

<head>
    <meta charset="UTF-8">
    <link href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css" rel="stylesheet">
    <link rel="stylesheet" href="app.css">
</head>

<body>

    <div class="flex">
        <div class="basis-1/3 bg-yellow-200">01</div>
        <div class="basis-2/3 bg-pink-200">02</div>
    </div>

</body>

</html>

berikut hasilnya:

3. Berdasarkan Ukuran Tetap (Container Scale)

<!DOCTYPE html>
<html lang="id">

<head>
    <meta charset="UTF-8">
    <link href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css" rel="stylesheet">
    <link rel="stylesheet" href="app.css">
</head>

<body>

    <div class="flex">
        <div class="basis-xs bg-gray-200">01</div>
        <div class="basis-sm bg-gray-400">02</div>
    </div>

</body>

</html>

berikut hasilnya:

4. Menggunakan Nilai Custom

<!DOCTYPE html>
<html lang="id">

<head>
    <meta charset="UTF-8">
    <link href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css" rel="stylesheet">
    <link rel="stylesheet" href="app.css">
</head>

<body>

    <div class="basis-[30vw] bg-purple-200">
        Lorem ipsum dolor sit amet consectetur adipisicing elit. Odio ipsam nostrum id neque iure. Maxime nobis pariatur impedit! Dolorem, ut.
      </div>
      
</body>

</html>

berikut hasilnya:

5. Responsive

<!DOCTYPE html>
<html lang="id">

<head>
    <meta charset="UTF-8">
    <link href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css" rel="stylesheet">
    <link rel="stylesheet" href="app.css">
</head>

<body>

    <div class="flex">
        <div class="basis-1/2 md:basis-1/4 bg-orange-200">Lorem ipsum dolor sit amet consectetur adipisicing elit. Delectus, aspernatur.</div>
        <div class="basis-1/2 md:basis-3/4 bg-lime-200">Lorem ipsum dolor sit amet consectetur adipisicing elit. Porro laborum cumque repellat in doloribus. Amet, necessitatibus. Ad ipsa eos soluta.</div>
    </div>

</body>

</html>

berikut hasilnya:

6. Kustomisasi Ukuran Sendiri

@theme {
  --container-4xs: 14rem;
}
<div class="basis-4xs bg-sky-200">
  <!-- Ukuran awal 14rem -->
</div>

 

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