@KetanKumar
Thank you for writing back. I attached the CSS code of theme.min.js here. Please take a look. Thanks for your help in advance.
!function(t,e){function n(t,e){let n;return(...i)=>{clearTimeout(n),n=setTimeout(()=>t.apply(this,i),e)}}function i(t){const e=t||theme.stylesheet;return void 0===this.stylesheetPromise&&(this.stylesheetPromise=new Promise(t=>{const n=document.querySelector(`link[href="${e}"]`);n.loaded&&t(),window.onloadCSS(n,function(){t()})})),this.stylesheetPromise}function s(t){const e=["webkitTransitionEnd","otransitionend","oTransitionEnd","msTransitionEnd","transitionend"],n=["WebkitTransition","MozTransition","OTransition","msTransition","transition"];let i=0,s=Promise.resolve();return n.forEach(()=>{i||(i=parseFloat(window.getComputedStyle(t).transitionDuration))}),i>0&&(s=new Promise(n=>{function i(e){e.target===t&&(s.forEach(({event:event,handler:handler})=>{t.removeEventListener(event,handler)}),n())}const s=e.map(e=>{return t.addEventListener(e,i),{event:e,handler:i}})})),s}function r(){let t=window.navigator.cookieEnabled;return t||(document.cookie="testcookie",t=document.cookie.indexOf("testcookie")!==-1),t}function o(t){const e=document.createElement("span");e.innerHTML=t.selectedOptions[0].label,document.querySelector(".footer").appendChild(e);const n=e.offsetWidth;e.remove(),t.style.width=`${n+50}px`}function a(){return"IntersectionObserver"in window&&"IntersectionObserverEntry"in window&&"intersectionRatio"in window.IntersectionObserverEntry.prototype}function c(t,e="min"){return`(${e}-width: ${{medium:"46.85em",large:"61.85em",widescreen:"87.5em"}[t]})`}function d(){return JSON.parse(JSON.stringify({credentials:"same-origin",headers:{"X-Requested-With":"XMLHttpRequest","Content-Type":"application/json;"}}))}function l(t,e){return fetch(t,e).then(function(t){if(!t.ok)throw t;return t.json()})}function u(){return l("/cart.js",d())}function h(t){var e=d();return delete e.headers["Content-Type"],e.method="POST",e.body=t,l("/cart/add.js",e)}function m(t,e){var n=d();return e=e||{},n.method="POST",n.body=JSON.stringify({line:t,quantity:e.quantity,properties:e.properties}),l("/cart/change.js",n)}function p(t){var e=d();return e.method="POST",e.body=JSON.stringify(t),l("/cart/update.js",e)}function f(t){if("string"!=typeof t||2!==t.split(":").length)throw new TypeError("Theme Cart: Provided key value is not a string with the format xxx:xxx")}function g(t){if("number"!=typeof t||isNaN(t))throw new TypeError("Theme Cart: An object which specifies a quantity or properties value is required")}function y(t){if("number"!=typeof t||isNaN(t))throw new TypeError("Theme Cart: Variant ID must be a number")}function v(t){if("object"!=typeof t)throw new TypeError("Theme Cart: Properties must be an object")}function w(t){if(!(t instanceof HTMLFormElement))throw new TypeError("Theme Cart: Form must be an instance of HTMLFormElement")}function b(t){if("object"!=typeof t)throw new TypeError("Theme Cart: Options must be an object");if(void 0===t.quantity&&void 0===t.properties)throw new Error("Theme Cart: You muse define a value for quantity or properties");void 0!==t.quantity&&g(t.quantity),void 0!==t.properties&&v(t.properties)}function C(){return u()}function E(t){return f(t),u().then(function(e){var n=-1;return e.items.forEach(function(e,i){n=e.key===t?i+1:n}),n===-1?Promise.reject(new Error("Theme Cart: Unable to match line item with provided key")):n})}function S(t){w(t);var e=new FormData(t);return y(parseInt(e.get("id"),10)),h(e)}function L(t,e){return f(t),b(e),E(t).then(function(t){return m(t,e)})}function _(t){return p({note:t})}function T(){return p({note:""})}function I(){this.entries=[]}function k(t,e){return q(t),A(t,M(t,e))}function A(t,e){return q(t),H(e),t.variants.filter(function(t){return e.every(function(e,n){return t.options[n]===e})})[0]||null}function M(t,e){q(t),P(e);var n=[];return e.forEach(function(e){for(var i=0;i