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Real Time CSS Form Validation Boilerplate

HTML
<div class="container"> <form class="registration"> <h1>Registration Form</h1> <label for="username"> <span>Username</span> <input type="text" id="username" minlength="3" required> <ul class="input-requirements"> <li>At least 3 characters long</li> <li>Must only contain letters and numbers (no special characters)</li> </ul> </label> <label for="password"> <span>Password</span> <input type="password" id="password" maxlength="100" minlength="8" required> <ul class="input-requirements"> <li>At least 8 characters long (and less than 100 characters)</li> <li>Contains at least 1 number</li> <li>Contains at least 1 lowercase letter</li> <li>Contains at least 1 uppercase letter</li> <li>Contains a special character (e.g. @ !)</li> </ul> </label> <label for="password_repeat"> <span>Repeat Password</span> <input type="password" id="password_repeat" maxlength="100" minlength="8" required> </label> <br> <input type="submit"> </form> </div>
CSS
/* General layout */ html { font-size: 62.5%; } body { font-size: 1.6rem; line-height: 1.6; font-family: 'Source Sans Pro'; background-color: rgb(245, 245, 245); } h1 { font-size: 2.5rem; padding: 15px 20px; background-color: rgba(255, 219, 58, 0.3); margin-bottom: 20px; text-align: center; } a { text-decoration: underline; color: inherit; } .container { margin: 80px auto; width: 90%; max-width: 800px; } .registration { background-color: #fff; max-width: 600px; margin: 0 auto; padding-bottom: 20px; box-shadow: 1px 1px 5px 0px rgba(0,0,0,0.3); border-bottom: 5px solid #ffdb3a; } .input-requirements { font-size: 1.3rem; font-style: italic; text-align: left; list-style: disc; list-style-position: inside; max-width: 400px; margin: 10px auto; color: rgb(150,150,150); } .input-requirements li.invalid { color: #e74c3c; } .input-requirements li.valid { color: #2ecc71; } .input-requirements li.valid:after { display: inline-block; padding-left: 10px; content: "\2713"; } /* FormHack v1.2.0 (formhack.io) */ /* Config ----------------------------- */ :root { /* Font */ --fh-font-family: 'Source Sans Pro', sans-serif; --fh-font-size: 15px; --fh-font-color: rgb(40, 40, 40); /* Borders */ --fh-border-radius: 3px; --fh-border-width: 1px; --fh-border-style: solid; --fh-border-color: rgb(200, 200, 200); /* Inputs, Textareas, Select, Option */ --fh-input-height: 40px; --fh-input-width: 100%; --fh-input-max-width: 400px; --fh-input-bg-color: rgb(250,250,250); --fh-focus-bg-color: var(--fh-input-bg-color); --fh-focus-border-color: #000; --fh-focus-font-color: var(--fh-font-color); /* Select Vendor Styling */ --fh-select-vendor-styling: none; /* comment this out to maintain vendor styling */ /* Buttons & Input Submits */ --fh-button-height: 40px; --fh-button-width: 100%; --fh-button-max-width: 200px; --fh-button-font-color: var(--fh-font-color); --fh-button-bg-color: rgba(255, 219, 58,0.3); --fh-button-hover-bg-color: rgb(255, 219, 58); --fh-button-hover-font-color: var(--fh-font-color); /* Layout */ --fh-layout-display: block; --fh-layout-margin: 10px auto; /* change to "10px auto" to center */ --fh-layout-text-align: center; } /* Global Reset Styles ------------------ */ input, textarea, select, option, optgroup, button, legend, fieldset { box-sizing: border-box; outline: none; font-family: var(--fh-font-family); font-size: var(--fh-font-size); color: var(--fh-font-color); vertical-align: top; display: var(--fh-layout-display); margin: var(--fh-layout-margin); text-align: var(--fh-layout-text-align); } datalist { font-family: var(--fh-font-family); font-size: var(--fh-font-size); } label { display: block; margin: var(--fh-layout-margin); text-align: var(--fh-layout-text-align); margin-bottom: 20px; position: relative; padding: 0 20px; } /* Input & Textarea ------------------ */ /* Fields with standard width */ input[type="text"], input[type="email"], input[type="password"], input[type="search"], input[type="color"], input[type="date"], input[type="datetime-local"], input[type="month"], input[type="number"], input[type="tel"], input[type="time"], input[type="url"], input[type="week"], input[list], input[type="file"], select, textarea { width: var(--fh-input-width); max-width: var(--fh-input-max-width); padding: calc( var(--fh-input-height) / 5 ); background-color: var(--fh-input-bg-color); border-radius: var(--fh-border-radius); border-width: var(--fh-border-width); border-style: var(--fh-border-style); border-color: var(--fh-border-color); } /* Fields with standard height */ input[type="text"], input[type="email"], input[type="password"], input[type="search"], input[type="color"], input[type="date"], input[type="datetime-local"], input[type="month"], input[type="number"], input[type="tel"], input[type="time"], input[type="url"], input[type="week"], input[list] { height: var(--fh-input-height); -webkit-appearance: none; } /* Other */ textarea { -webkit-appearance: none; overflow: auto; } input[type="range"] { height: var(--fh-input-height); width: var(--fh-input-width); max-width: var(--fh-input-max-width); } input[type="file"] { min-height: var(--fh-input-height); } input[type="search"] { height: var(--fh-input-height); -webkit-appearance: none; } input[type="search"]::-webkit-search-cancel-button, input[type="search"]::-webkit-search-decoration { -webkit-appearance: none; } input[type="checkbox"], input[type="radio"] { display: inline-block; vertical-align: middle; } /* For checkbox and radio to be centered, need to wrap the input and label in a span - /* .checkbox-container { /* display: block; /* text-align: center; /* } /* Select ------------------ */ select { height: var(--fh-input-height); -webkit-appearance: var(--fh-select-vendor-styling, menulist); -moz-appearance: var(--fh-select-vendor-styling, menulist); -ms-appearance: var(--fh-select-vendor-styling, menulist); -o-appearance: var(--fh-select-vendor-styling, menulist); } select[multiple] { height: auto; min-height: var(--fh-input-height); padding: 0; } select[multiple] option { margin: 0; padding: calc( var(--fh-input-height) / 5 ); } /* Fieldset ------------------ */ fieldset { padding: 0; border: 0; } legend { padding: 0; font-weight: inherit; } /* Buttons, Input Type Submit/Reset ------------------ */ button, input[type="button"], input[type="submit"], input[type="reset"], input[type="image"] { height: var(--fh-button-height); width: var(--fh-button-width); max-width: var(--fh-button-max-width); background-color: var(--fh-button-bg-color); padding: calc( var(--fh-input-height) / 5 ); cursor: pointer; color: var(--fh-button-font-color); font-weight: 700; -webkit-appearance: none; -moz-appearance: none; border-radius: var(--fh-border-radius); border-width: var(--fh-border-width); border-style: var(--fh-border-style); border-color: var(--fh-border-color); box-shadow: 1px 1px 5px 0px rgba(0,0,0,0.2); } input[type="image"] { text-align: center; padding: calc( var(--fh-input-height) / 5 ); } /* States ------------------ */ input[disabled], textarea[disabled], select[disabled], option[disabled], button[disabled] { cursor: not-allowed; } input:focus, textarea:focus, select:focus, option:focus, button:focus { background-color: var(--fh-focus-bg-color); border-color: var(--fh-focus-border-color); } input[type="checkbox"]:focus, input[type="radio"]:focus { outline: var(--fh-focus-border-color) solid 2px; } button:hover, input[type="button"]:hover, input[type="submit"]:hover, input[type="reset"]:hover, button:focus, input[type="button"]:focus, input[type="submit"]:focus, input[type="reset"]:focus { background-color: var(--fh-button-hover-bg-color); color: var(--fh-button-hover-font-color); } /* Custom ------------------ */ input:not([type="submit"]):valid { border-color: #2ecc71; } /* Hide and show related .input-requirements when interacting with input */ input:not([type="submit"]) + .input-requirements { overflow: hidden; max-height: 0; transition: max-height 1s ease-out; } input:not([type="submit"]):hover + .input-requirements, input:not([type="submit"]):focus + .input-requirements, input:not([type="submit"]):active + .input-requirements { max-height: 1000px; /* any large number (bigger then the .input-requirements list) */ transition: max-height 1s ease-in; }
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