input[type="checkbox"].checkbox { appearance: none; } .checkbox { display: inline-block; align-self: center; width: var(--checkbox-width); height: var(--checkbox-height); background: var(--danger-color); border: var(--checkbox-border-width) solid var(--danger-border-color); border-radius: var(--border-radius-checkbox); transition: background var(--transition-long-animation-duration) ease, border-color var(--transition-long-animation-duration) ease; } .checkbox:after { content: ""; font-family: var(--fa-style-family, "Font Awesome 6 Free"); font-weight: var(--fa-style, 900); text-align: center; line-height: calc(var(--checkbox-height) - var(--checkbox-border-width) * 2); display: block; position: relative; background: var(--text-color); width: calc(var(--checkbox-height) - var(--checkbox-border-width) * 2); height: calc(var(--checkbox-height) - var(--checkbox-border-width) * 2); border-radius: 100%; left: 0; transition: left var(--transition-long-animation-duration) ease; } .checkbox:checked { background: var(--success-color); border-color: var(--success-border-color); transition: background var(--transition-long-animation-duration) ease, border-color var(--transition-long-animation-duration) ease; } .checkbox:checked:after { content: ""; left: calc(var(--checkbox-width) - var(--checkbox-height)); transition: left var(--transition-long-animation-duration) ease; }