Create styles.css

styles.css

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+@import url('https://fonts.googleapis.com/css2?family=K2D:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800&display=swap');
+
+			:root{
+    --background: #11141b;
+    --primary-color: #3a3c442f;
+    --secondary-color: #4A4D57;
+    --accent-color: rgb(100, 25, 240);
+    --text-color: #F9F6F9;
+}
+
+*{
+    margin: 0;
+    padding: 0;
+}
+
+html {
+    font-family: 'K2D', monospace;
+    font-size: 13.69pt;
+    color: var(--text-color);
+}
+
+body {
+    min-height: 100vh;
+    padding: 10px;
+    background-color: var(--background);
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+}
+
+h1 {
+    margin-top: 100px;
+    margin-bottom: 20px;
+    font-size: 3rem;
+    font-weight: 800;
+    text-transform: uppercase;
+    text-align: center;
+    color: var(--accent-color);
+}
+
+.wrapper {
+    width: 700px;
+    max-width: 100%;
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+}
+
+#todo-input {
+    box-sizing: border-box;
+    padding: 12px 20px;
+    width: 100%;
+    background: none;
+    border: 2px solid var(--secondary-color);
+    border-radius: 1000px;
+    font: inherit;
+    color: var(--text-color);
+    caret-color: var(--accent-color);
+}
+
+#todo-input:focus {
+    outline: none;
+}
+
+form {
+    position: relative;
+}
+
+#add-btn {
+    position: absolute;
+    top: 0;
+    right: 0;
+    background-color: var(--accent-color);
+    height: 100%;
+    padding: 0 22px;
+    border: none;
+    border-radius: 1000px;
+    font: inherit;
+    font-weight: 600;
+    color: var(--background);
+    cursor: pointer;
+}
+
+.todo {
+    margin-bottom: 10px;
+    padding: 0 3vw;
+    background-color: var(--primary-color);
+    border-radius: 15px;
+    display: flex;
+    align-items: center;
+}
+
+.todo .todo-text {
+    padding: 13.69px;
+    padding-right: 0;
+    flex-grow: 1;
+    transition: 200ms ease;
+}
+
+.del-btn {
+    padding: 3px;
+    background: none;
+    border: none;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    cursor: pointer;
+}
+
+.del-btn svg {
+    transition: 200ms ease;
+}
+
+.del-btn:hover svg{
+    fill: #ff0616;
+}
+
+.custom-checkbox {
+    border: 2px solid var(--accent-color);
+    border-radius: 60%;
+    min-height: 20px;
+    min-width: 26;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    flex-shrink: 0;
+    transition: 200ms ease;
+    cursor: pointer;
+}
+
+input[type="checkbox"]:checked ~ .custom-checkbox {
+    background-color: var(--accent-color);
+}
+
+input[type="checkbox"]:checked ~ .custom-checkbox svg{
+    fill: #211;
+}
+
+input[type="checkbox"]:checked ~ .todo-text {
+    text-decoration: line-through;
+    color: var(--secondary-color);
+}
+
+input[type="checkbox"] {
+    display: none;
+}
+
+@media(max-width: 500px) {
+    html {
+        font-size: 12pt;
+    }
+    h1 {
+        margin-top: 50px;
+        font-size: 15vw;
+    }
+}