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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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JavaScript

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HTML 

              
                <h1>Preloaders</h1>
<p class='sub-title'>Styled & Animated With Pure CSS</p>
    
<div class="loaders">
  <ol>
    <li>
      <div class="loftloader-wrapper pl-sun">
        <div class="loader">
          <span></span>
        </div>
      </div>
    </li>

    <li>
      <div class="loftloader-wrapper pl-circles">
        <div class="loader">
          <span></span>
        </div>
      </div>
    </li>

    <li>
      <div class="loftloader-wrapper pl-wave">
        <div class="loader">
          <span></span>
        </div>
      </div>
    </li>

    <li>
      <div class="loftloader-wrapper pl-square">
        <div class="loader">
          <span></span>
        </div>
      </div>
    </li>

    <li>
      <div class="loftloader-wrapper pl-frame">
        <div class="loader">
          <span></span>
        </div>
      </div>
    </li>

    <li>
      <div class="loftloader-wrapper pl-imgloading">
        <div class="loader">
          <span></span>
          <img src="http://www.loftocean.com/wp-content/uploads/2016/06/loftloader-logo.png" alt="loftloader">
        </div>
      </div>
    </li>
  </ol>
</div>
!

CSS 

              
                $primary-color: #248ACC;

@mixin flexbox {
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
}

@mixin flex-vertical {
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-flow: column wrap;
  -ms-flex-flow: column wrap;
  flex-flow: column wrap;
  -webkit-justify-content: center;
  justify-content: center;
}

@mixin flex-horizontal {
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  -webkit-flex-flow: row wrap;
  -ms-flex-flow: row wrap;
  flex-flow: row wrap;
  -webkit-justify-content: flex-start;
  justify-content: flex-start;
}

@mixin transform($transform) {
  -webkit-transform: $transform;
  -ms-transform: $transform;
  transform: $transform;
}

@mixin animation($animation) {
  -webkit-animation: $animation;
  animation: $animation;
}

body {
  font: 100% Helvetica, sans-serif;
  color: #333;
  padding: 0;
  margin: 0;
  background: #F6F6F6;
  text-align: center;
}

h1,
p.sub-title {
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

h1,
.loaders {
  margin-top: 50px;
}

.loaders {
  ol {
    padding: 0;
    margin-left: 2.5vw;
    list-style: none;
    @include flexbox;
    @include flex-horizontal;
    
    li {
      position: relative;
      width: 31vw;
      height: 31vw;
      margin: 0 1vw 1vw 0;
      background: #FFF;
      transition: background 0.35s;
      
      @include flexbox;
      @include flex-vertical;
      
      &:nth-child(3n) {
        margin-right: 0;
      }
      
      @media screen and (max-width : 768px) {
        & {
          width: 46vw;
          height: 46vw;
          margin: 0 3vw 3vw 0;
        }
        
        &:nth-child(2n) {
          margin-right: 0;
        }
        
        &:nth-child(3) {
          margin-right: 3vw;
        }
      }
      
      &:before {
        position: absolute;
        bottom: 0;
        left: 0;
        z-index: -1;
        display: block;
        width: 31vw;
        height: 28vw;
        content: "";
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
        
        @media screen and (max-width : 768px) {
          & {
            width: 46vw;
            height: 43vw;
          }
        }
      }
      
      .loader {
        position: relative;
        margin: 0 auto;
      }
      
      /* Spinning Sun */
      .pl-sun .loader {
        width: 50px;
        height: 50px;
        
        span,
        span:before {
          position: absolute;
          top: 0;
          left: 0;
          display: block;
          background: $primary-color;
          opacity: 0.9;
          transform-origin: 50% 50%;
        }
        
        span {
          width: 50px;
          height: 50px;
          @include animation(spinReturn 4s ease infinite);
          
          &:before {
            width: 100%;
            height: 100%;
            content: "";
            @include transform(rotate(45deg));
          }
        }
      }
      
      /* Luminous Circles */
      .pl-circles .loader {
        width: 100px;
        height: 60px;
        
        span,
        &:before,
        &:after {
            position: absolute;
            display: block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            opacity: 0.2;
            background: $primary-color;
        }
        
        span {
          top: 50%;
          left: 50%;
          @include transform(translate(-50%, -50%));
          @include animation(lightUp 1.5s linear infinite 0.5s);
        }
        
        &:before,
        &:after {
          content: "";
        }
        
        &:before {
          top: 50%;
          left: 0;
          @include transform(translate(0, -50%));
          @include animation(lightUp 1.5s linear infinite);
        }
        
        &:after {
          top: 50%;
          right: 0;
          @include transform(translate(0, -50%));
          @include animation(lightUp 1.5s linear infinite 1s);
        }
      }
      
      /* Wave */
      .pl-wave .loader {
        width: 50px;
        height: 30px;
        
        span,
        &:before,
        &:after {
          position: absolute;
          display: block;
          width: 6px;
          height: 100%;
          background: $primary-color;
        }
        
        span {
          top: 50%;
          left: 50%;
          @include transform(translate(-50%, -50%));
          @include animation(wave 0.9s linear infinite 0.3s);
        }
        
        &:before,
        &:after {
          content: "";
        }
        
        &:before {
          top: 50%;
          left: 0;
          @include transform(translate(0, -50%));
          @include animation(wave 0.9s linear infinite);
        }
        
        &:after {
          top: 50%;
          right: 0;
          @include transform(translate(0, -50%));
          @include animation(wave 0.9s linear infinite 0.6s);
        }
      }
      
      /* Spinning Square */
      .pl-square .loader {
        width: 50px;
        height: 50px;
        transform-origin: 50% 50%;
        @include animation(spinReturn 4s ease infinite);
        
        span {
          position: absolute;
          top: 0;
          left: 0;
          display: block;
          width: 100%;
          height: 100%;
          border: 4px solid $primary-color;
          transform-origin: 50% 50%;
          @include transform(rotate(45deg));
        }
      }
      
      /* Drawing Frame */
      .pl-frame .loader {
        width: 60px;
        height: 60px;
        
        span {
          position: absolute;
          top: 0;
          left: 0;
          display: block;
          width: 100%;
          height: 100%;
          
          &:before,
          &:after {
            position: absolute;
            width: 4px;
            height: 100%;
            background: $primary-color;
            content: "";
          }
          
          &:before {
            top: auto;
            right: 0;
            bottom: 0;
            @include animation(drawframeRight 4s linear infinite 0.5s);
          }
          
          &:after {
            top: 0;
            bottom: auto;
            left: 0;
            @include animation(drawframeLeft 4s linear infinite 1.5s);
          }
        }
        
        &:before,
        &:after {
          position: absolute;
          width: 100%;
          height: 4px;
          background: $primary-color;
          content: "";
        }
        
        &:before {
          top: 0;
          right: 0;
          left: auto;
          @include animation(drawframeTop 4s linear infinite);
        }
        
        &:after {
          right: auto;
          bottom: 0;
          left: 0;
          @include animation(drawframeBottom 4s linear infinite 1s);
        }
      }
      
      /* Image Loading */
      .pl-imgloading .loader {
        width: 76px;
        height: auto;
        
        span {
          position: absolute;
          bottom: 0;
          left: 0;
          z-index: 3;
          display: block;
          width: 100%;
          height: 0%;
          background: url(http://www.loftocean.com/wp-content/uploads/2016/06/loftloader-logo.png) center bottom;
          background-repeat: no-repeat;
          background-size: cover;
          @include animation(imgLoading 6s linear infinite);
          transition: 0s;
        }
        
        img {
          position: relative;
          z-index: 1;
          display: block;
          width: 100%;
          height: auto;
          opacity: 0.3;
        }
      } 
    }
    
    &:after {
      display: block;
      clear: both;
      content: "";
      position: relative;
    }
  }
}

/* Animations */

@-webkit-keyframes spinReturn {
    0% {
        -webkit-transform: rotate(0deg);
    }
    25% {
        -webkit-transform: rotate(225deg);
    }
    50% {
        -webkit-transform: rotate(180deg);
    }
    75% {
        -webkit-transform: rotate(405deg);
    }
    100% {
        -webkit-transform: rotate(360deg);
    }
}

@keyframes spinReturn {
    0% {
        transform: rotate(0deg);
    }
    25% {
        transform: rotate(225deg);
    }
    50% {
        transform: rotate(180deg);
    }
    75% {
        transform: rotate(405deg);
    }
    100% {
        transform: rotate(360deg);
    }
}


@-webkit-keyframes lightUp {
    0% {
        opacity: 0.2;
    }
    40% {
        opacity: 1;
    }
    60% {
        opacity: 0.2;
    }
    100% {
        opacity: 0.2;
    }
}

@keyframes lightUp {
    0% {
        opacity: 0.2;
    }
    40% {
        opacity: 1;
    }
    60% {
        opacity: 0.2;
    }
    100% {
        opacity: 0.2;
    }
}


@-webkit-keyframes wave {
    0% {
        height: 100%
    }
    40% {
        height: 10%;
    }
    80% {
        height: 100%;
    }
    100% {
        height: 100%;
    }
}

@keyframes wave {
    0% {
        height: 100%
    }
    40% {
        height: 10%;
    }
    80% {
        height: 100%;
    }
    100% {
        height: 100%;
    }
}


@-webkit-keyframes drawframeTop {
    0% {
        right: 0;
        left: auto;
        width: 100%;
    }
    12.5% {
        right: 0;
        left: auto;
        width: 0%;
    }
    50% {
        right: auto;
        left: 0;
        width: 0%;
    }
    62.5% {
        right: auto;
        left: 0;
        width: 100%;
    }
    100% {
        right: auto;
        left: 0;
        width: 100%;
    }
}

@keyframes drawframeTop {
    0% {
        right: 0;
        left: auto;
        width: 100%;
    }
    12.5% {
        right: 0;
        left: auto;
        width: 0%;
    }
    50% {
        right: auto;
        left: 0;
        width: 0%;
    }
    62.5% {
        right: auto;
        left: 0;
        width: 100%;
    }
    100% {
        right: auto;
        left: 0;
        width: 100%;
    }
}

@-webkit-keyframes drawframeBottom {
    0% {
        right: auto;
        left: 0;
        width: 100%;
    }
    12.5% {
        right: auto;
        left: 0;
        width: 0%;
    }
    50% {
        right: 0;
        left: auto;
        width: 0%;
    }
    62.5% {
        right: 0;
        left: auto;
        width: 100%;
    }
    100% {
        right: 0;
        left: auto;
        width: 100%;
    }
}

@keyframes drawframeBottom {
    0% {
        right: auto;
        left: 0;
        width: 100%;
    }
    12.5% {
        right: auto;
        left: 0;
        width: 0%;
    }
    50% {
        right: 0;
        left: auto;
        width: 0%;
    }
    62.5% {
        right: 0;
        left: auto;
        width: 100%;
    }
    100% {
        right: 0;
        left: auto;
        width: 100%;
    }
}

@-webkit-keyframes drawframeRight {
    0% {
        top: auto;
        bottom: 0;
        height: 100%;
    }
    12.5% {
        top: auto;
        bottom: 0;
        height: 0%;
    }
    50% {
        top: 0;
        bottom: auto;
        height: 0%;
    }
    62.5% {
        top: 0;
        bottom: auto;
        height: 100%;
    }
    100% {
        top: 0;
        bottom: auto;
        height: 100%;
    }
}

@keyframes drawframeRight {
    0% {
        top: auto;
        bottom: 0;
        height: 100%;
    }
    12.5% {
        top: auto;
        bottom: 0;
        height: 0%;
    }
    50% {
        top: 0;
        bottom: auto;
        height: 0%;
    }
    62.5% {
        top: 0;
        bottom: auto;
        height: 100%;
    }
    100% {
        top: 0;
        bottom: auto;
        height: 100%;
    }
}

@-webkit-keyframes drawframeLeft {
    0% {
        top:  0;
        bottom: auto;
        height: 100%;
    }
    12.5% {
        top: 0;
        bottom: auto;
        height: 0%;
    }
    50% {
        top: auto;
        bottom: 0;
        height: 0%;
    }
    62.5% {
        top: auto;
        bottom: 0;
        height: 100%;
    }
    100% {
        top: auto;
        bottom: 0;
        height: 100%;
    }
}

@keyframes drawframeLeft {
    0% {
        top:  0;
        bottom: auto;
        height: 100%;
    }
    12.5% {
        top: 0;
        bottom: auto;
        height: 0%;
    }
    50% {
        top: auto;
        bottom: 0;
        height: 0%;
    }
    62.5% {
        top: auto;
        bottom: 0;
        height: 100%;
    }
    100% {
        top: auto;
        bottom: 0;
        height: 100%;
    }
}



@-webkit-keyframes imgLoading {
    0% {
        width: 100%;
        height: 0%;
        opacity: 1;
    }
    95% {
        width: 100%;
        height: 100%;
        opacity: 1;
    }
    
    100% {
        width: 100%;
        height: 100%;
        opacity: 0;
    }
}

@keyframes imgLoading {
    0% {
        width: 100%;
        height: 0%;
        opacity: 1;
    }
    95% {
        width: 100%;
        height: 100%;
        opacity: 1;
    }
    
    100% {
        width: 100%;
        height: 100%;
        opacity: 0;
    }
}
!

JS
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999px

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