将SVG图标垂直对齐以在UL中居中

Question

我为此创建了一个示例代码，这样将更有意义。我想将所有图标垂直居中对齐。图标的大小不同。我添加了边框用于调试目的，以便我们可以准确地看到它是否垂直居中。

我知道给LI标签提供固定宽度，然后使A标签垂直对齐的方法是绝对位置，但是我正在寻找更灵活的解决方案，因为在此示例中，我给SVG文件提供了固定宽度，但是将不会在主站点中发生。

谢谢。

.wrapper {
  width: 300px;
  margin: 50px auto;
  border: 2px solid grey;
}
.wrapper ul.socialmedia-menu {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin: 0px;
  padding: 0px;
}
.wrapper ul.socialmedia-menu li {
  list-style: none;
  border: 1px solid blue;
}
.wrapper ul.socialmedia-menu li a svg {
  width: 30px;
  height: auto;
}

<div class="wrapper">
  <ul class="socialmedia-menu">
      <li>
        <a href="#"><svg class="i_instagram" preserveAspectRatio="xMidYMid" width="18" height="18" viewBox="0 0 18 18"><use xlink:href="#i_instagram"></use></svg></a>
      </li>
      <li>
        <a href="#"><svg class="i_twitter" preserveAspectRatio="xMidYMid" width="18.438" height="15" viewBox="0 0 18.438 15"><use xlink:href="#i_twitter"></use></svg></a>
      </li>
      <li>
        <a href="#"><svg class="i_pinterest" preserveAspectRatio="xMidYMid" width="17.031" height="17.03" viewBox="0 0 17.031 17.03"><use xlink:href="#i_pinterest"></use>
          </svg></a>
      </li>
      <li>
        <a href="#"><svg class="i_facebook" preserveAspectRatio="xMidYMid" width="21.125" height="21.16" viewBox="0 0 21.125 21.16"><use xlink:href="#i_facebook"></use></svg></a>
      </li>
      <li>
        <a href="#"><svg class="i_tumblr" preserveAspectRatio="xMidYMid" width="9.126" height="15.53" viewBox="0 0 9.126 15.53"><use xlink:href="#i_tumblr"></use></svg></a>
      </li>
      <li>
        <a href="#"><svg class="i_email" preserveAspectRatio="xMidYMid" width="18" height="14" viewBox="0 0 18 14"><use xlink:href="#i_email"></use></svg></a>
      </li>
  </ul>
</div>


<!--- SVG DEFINITIONS : You can skip looking at it :) -->

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	<defs>
	<g id="i_instagram">
		<path d="M118.989,4005.62c2.4,0,2.689.01,3.638,0.06a4.811,4.811,0,0,1,1.672.31,2.807,2.807,0,0,1,1.036.67,2.765,2.765,0,0,1,.673,1.04,4.919,4.919,0,0,1,.31,1.67c0.043,0.95.052,1.23,0.052,3.64s-0.009,2.68-.052,3.63a5.054,5.054,0,0,1-.31,1.68,2.728,2.728,0,0,1-.673,1.03,2.687,2.687,0,0,1-1.036.67,4.811,4.811,0,0,1-1.672.31c-0.949.05-1.233,0.06-3.638,0.06s-2.689-.01-3.638-0.06a4.817,4.817,0,0,1-1.672-.31,2.684,2.684,0,0,1-1.035-.67,2.728,2.728,0,0,1-.673-1.03,5.027,5.027,0,0,1-.31-1.68c-0.044-.95-0.053-1.23-0.053-3.63s0.009-2.69.053-3.64a4.894,4.894,0,0,1,.31-1.67,2.765,2.765,0,0,1,.673-1.04,2.8,2.8,0,0,1,1.035-.67,4.817,4.817,0,0,1,1.672-.31c0.95-.05,1.234-0.06,3.638-0.06m0-1.62c-2.445,0-2.751.01-3.712,0.06a6.6,6.6,0,0,0-2.185.41,4.6,4.6,0,0,0-2.633,2.64,6.543,6.543,0,0,0-.419,2.18c-0.044.96-.054,1.27-0.054,3.72s0.01,2.75.054,3.71a6.543,6.543,0,0,0,.419,2.18,4.366,4.366,0,0,0,1.038,1.6,4.429,4.429,0,0,0,1.595,1.04,6.839,6.839,0,0,0,2.185.42c0.961,0.04,1.267.05,3.712,0.05s2.752-.01,3.712-0.05a6.84,6.84,0,0,0,2.186-.42,4.429,4.429,0,0,0,1.595-1.04,4.366,4.366,0,0,0,1.038-1.6,6.521,6.521,0,0,0,.418-2.18c0.044-.96.055-1.27,0.055-3.71s-0.011-2.76-.055-3.72a6.521,6.521,0,0,0-.418-2.18,4.6,4.6,0,0,0-2.633-2.64,6.6,6.6,0,0,0-2.186-.41c-0.96-.05-1.266-0.06-3.712-0.06h0Zm0,4.38a4.625,4.625,0,1,0,4.624,4.63A4.625,4.625,0,0,0,118.989,4008.38Zm0,7.63a3.005,3.005,0,1,1,3-3A3.005,3.005,0,0,1,118.989,4016.01Zm5.887-7.81a1.081,1.081,0,1,1-1.081-1.08A1.078,1.078,0,0,1,124.876,4008.2Z" transform="translate(-110 -4004)"></path>
	</g>
	</defs>
</svg>


<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" style="display: none;">
	<defs>
	<g id="i_twitter">
		<path d="M164.2,4007.27a7.544,7.544,0,0,1-2.174.59,3.8,3.8,0,0,0,1.664-2.09,7.673,7.673,0,0,1-2.4.92,3.784,3.784,0,0,0-6.549,2.59,3.871,3.871,0,0,0,.1.86,10.749,10.749,0,0,1-7.8-3.95,3.713,3.713,0,0,0-.512,1.9,3.788,3.788,0,0,0,1.684,3.15,3.818,3.818,0,0,1-1.715-.47v0.04a3.794,3.794,0,0,0,3.036,3.72,4.077,4.077,0,0,1-1,.13,4.161,4.161,0,0,1-.712-0.07,3.794,3.794,0,0,0,3.536,2.63,7.628,7.628,0,0,1-4.7,1.62,8.942,8.942,0,0,1-.9-0.05,10.766,10.766,0,0,0,16.572-9.07c0-.17,0-0.33-0.011-0.49A7.768,7.768,0,0,0,164.2,4007.27Z" transform="translate(-145.75 -4005.5)"></path>
	</g>
	</defs>
</svg>

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" style="display: none;">
	<defs>
	<g id="i_pinterest">
		<path d="M191.98,4004.48a8.508,8.508,0,0,0-3.415,16.3,7.452,7.452,0,0,1,.148-1.95c0.164-.69,1.095-4.64,1.095-4.64a3.235,3.235,0,0,1-.272-1.34c0-1.26.731-2.21,1.64-2.21a1.145,1.145,0,0,1,1.148,1.28,18.34,18.34,0,0,1-.751,3.02,1.318,1.318,0,0,0,1.342,1.64c1.612,0,2.7-2.07,2.7-4.52,0-1.87-1.256-3.26-3.54-3.26a4.025,4.025,0,0,0-4.188,4.07,2.473,2.473,0,0,0,.561,1.67,0.406,0.406,0,0,1,.122.47c-0.041.16-.134,0.54-0.173,0.69a0.294,0.294,0,0,1-.426.21,3.283,3.283,0,0,1-1.742-3.25c0-2.42,2.038-5.32,6.08-5.32a5.085,5.085,0,0,1,5.385,4.88c0,3.33-1.855,5.83-4.59,5.83a2.449,2.449,0,0,1-2.078-1.06s-0.494,1.96-.6,2.34a7.166,7.166,0,0,1-.856,1.82,8.711,8.711,0,0,0,2.411.35A8.51,8.51,0,0,0,191.98,4004.48Z" transform="translate(-183.469 -4004.47)"></path>
	</g>
	</defs>
</svg>


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	<defs>
	<g id="i_facebook">
		<path d="M19.284,21.151 L15.498,21.151 L15.498,11.216 L18.433,11.216 L18.653,8.347 L15.498,8.347 L15.498,7.447 L15.498,6.418 L15.498,6.106 C15.498,5.334 16.187,5.059 16.957,5.059 C17.726,5.059 18.551,5.298 18.551,5.298 L19.045,2.358 C19.045,2.358 17.993,2.002 15.498,2.002 C13.966,2.002 13.075,2.586 12.427,3.446 C11.811,4.258 11.789,5.569 11.789,6.418 L11.789,6.565 L11.789,7.447 L11.789,8.347 L9.810,8.347 L9.810,11.216 L11.789,11.216 L11.789,21.151 L1.835,21.151 C0.824,21.151 0.003,20.332 0.003,19.314 L0.003,1.826 C0.003,0.812 0.824,-0.011 1.835,-0.011 L19.284,-0.011 C20.295,-0.011 21.116,0.812 21.116,1.826 L21.116,19.314 C21.116,20.332 20.295,21.151 19.284,21.151 Z"></path>
	</g>
	</defs>
</svg>


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	<defs>
	<g id="i_tumblr">
		<path d="M267.393,4017.64a1.37,1.37,0,0,1-1.525-1.53v-4.56h2.957v-2.64H265.88v-3.93h-2.322a0.131,0.131,0,0,0-.114.12,4.753,4.753,0,0,1-3.119,4.18v2.27h1.83v4.8c0,1.74,1.082,4.2,4.534,4.15a4.3,4.3,0,0,0,2.746-.91l-0.763-2.21A3.993,3.993,0,0,1,267.393,4017.64Z" transform="translate(-260.312 -4004.97)"></path>
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	</defs>
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	<defs>
	<g id="i_email">
		<path d="M291.988,4005.99v14h18v-14h-18Zm16.14,1.55-7.139,6-7.139-6h14.278Zm-14.64,10.9v-9.2l7.5,6.31,7.5-6.31v9.2h-15Z" transform="translate(-292 -4006)"></path>
	</g>
	</defs>
</svg>

Answer 1

父项li上的

for (i in 1:dim(BF_array)[3]){ x <- 1:5 y <- 1:5 z <-i cls <-rainbow(70,start=0.001,end=1.) filled.contour(abs(x),abs(y),z,ylim = c(1,5),col = cls, nlevels=50, main="Wassergehalte in %nFK", plot.axes={axis(1);axis(2);contour(abs(x),abs(y),z,nlevels=20,add=T,lwd=1,col="brown",axes=F)})} 带有align-items以垂直对齐SVG。

  

.wrapper ul.socialmedia-menu li {
     显示：-webkit-flex;
显示：flex;
    -webkit-align-items：中心;
    align-items：center;
    -webkit-justify-content：中心；
    证明内容：中心；
  }

display:flex

.wrapper {
  width: 300px;
  margin: 50px auto;
  border: 2px solid grey;
}
.wrapper ul.socialmedia-menu {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin: 0px;
  padding: 0px;
}
.wrapper ul.socialmedia-menu li {
  list-style: none;
  border: 1px solid blue;
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  -webkit-justify-content: center;
  justify-content: center;
}
.wrapper ul.socialmedia-menu li a svg {
  width: 30px;
  height: auto;
}